Mathematics College

Solve this using substitution method. Many many thanks

Solve This Using Substitution Method. Many Many Thanks

Answers

Answer 1

Answer:

y=2 and x=1

Step-by-step explanation:

sub 2 into 1

3(15-7y) + 4y= 11

45 - 21y +4y =11

-21y+4y= 11-45

-17y= - 34

y=2

Therefore sub y into x equation

x=15-7(2)

x= 1

Answer 2

Answer:

3x + 4y = 11

x = 15 -7 y

3 (15-7y) = 11

45 - 21y + 4y = 11

45 - 17 y = 11

-17 y =11 -45

-17y ÷ -17 = -34 ÷ -17

y = 2

x = 15 - 7y

x = 15 - 7(2)

x = 15 - 14

x = 1

there for y = 2 and x = 1 is the solution

Related Questions

Help please!!!
I’m failing math and I need help

Answers

Answer:

3.

vertically opposite angles ,

= 30°

4. 50° +30°+2x = 180°

80°+2x=180°

2x=180°-80°

2x=100°

Triangle PQR IS SIMILAR TO Triangle KLM.

What is the value of x in inches?

A 7 in.
B 148 in.
C 92 in.
D 168 in.

Answers

D. 168 in.

15/72 = 35/168

Clara went to a music store and brought some CDs and DVDs. She paid $14 for each CD and $17 for each DVD. Let x represent the number of CDs that she purchased and y represent the number of DVDs.

Answers

14x+17y= total spent

8increase by 3 times a number (t).
​

Answers

Answer:

8 + 3n

Step-by-step explanation:

Answer:

8 + 3t

Explanation:

What is x in 1/150/1/200x2=x

Answers

Answer:

6.66666667E-5

hope this helped a bit!

Please help will give brainliest

Answers

Answer:

25 is the area because5 times 5 equals 25

Step-by-step explanation:

hope this helps

Answer:

25

Step-by-step explanation:

please help me i really need help please

Answers

Answer:

39°

Step-by-step explanation:

180-90-51=39

Answer:

its 39

Step-by-step explanation:

you know that a right triangle already has the angle 90 so 51 plus 90 equals 141

180-141=39

Please help me I don’t get it

Answers

Answer:

The number is 4

Step-by-step explanation:

We set up the equation given the conditions listed. Since it says 5 times the difference between a number and 7, we can use x as a placeholder for the number.

(x-7) is the difference between the number and 7. The question asks for 5 times that difference thus we multiply the entire thing by 5 giving us 5(x-7. The question says that it all equals -15 so we set that expression equal to -15.

Thus we get the equation and solve:

5(x-7)= -15 (distributive property)

5x-35= -15 (add 35 to both sides)

5x=20 (divide by 5)

x=4; so the number is 4

in the coordinate plain the point located at (-3,4) was reflected and is now located at (3,4). how was the point reflected

Answers

Answer:

they reflect thru the y-axis

Step-by-step explanation:

please help what is the value of
tan^2(180-tetha)​

Answers

Answer:

1/cos^2(180-theta) - 1

Step-by-step explanation:

According to trigonometry identity

tan^2 theta + 1 = sec^2 theta

tan^2 theta = sec^2 theta - 1

hence tan^2(180-tetha)​ = sec^2 (180 -theta) - 1

tan^2(180-tetha)​ = 1/cos^2(180-theta) - 1

Hence the value of tan^2(180-tetha)​ is 1/cos^2(180-theta) - 1

Luis walked for 16 minutes. Natalie walked for w minutes. Luis walked twice as long as Natalie. How long did Natalie walk?

Answers

Answer:

Natalie walked for 4 minutes because 16 divided by 2 is 4

Answer:

8

Step-by-step explanation:

16/2=8

Identify each part in the expression below. will give brainliest

Answers

Answer:

smalls

Step-by-step explanation:

A computer program found that the line c=2t−89c=2t−89c=2t−89 is a good fit for the data. Use this equation to predict how many cups of lemonade Lin might sell on a day when the high temperature is 74 degrees.

Answers

Answer:

58cups

Step-by-step explanation:

Given the equation for the line as c = 2t - 89

If the temperature is 74 degrees, then we can find the number of cups at this temperature;

Substitute t = 74 unti the expression

x = 2(74) - 89

c = 147 - 89

c = 58cups

Hence the number of cups of lemonade is 58cups

Which point does not lie on the graph of x + 7y = 7?

Answers

D is correct I believe

answers needed nowwwwwwwww

Answers

the answer is X=118 because if you add 118 to 3 you get 121 and that is the equal to the other side

There are 6 pretzel sticks. 5 friends want to share them evenly. How much would each friend get?
oShow your answer two different ways.
Use your draw tool.

Answers

Well, there is one for you, the. there is your five friends which both recieve one. if you don't want to give one to yourself and just ur friends you divide 6 and 5 they all would get 1.2

The dot plot shows the number of books Melanie's classmates have read. Approximately what percent of Melanie’s classmates have read more than 7 books

Answers

Answer:

.30

Step-by-step explanation:

No rush but what is the formula for finding the area of a polygon

Answers

Answer: To find the area of a regular polygon, all you have to do is follow this simple formula: area = 1/2 x perimeter x apothem.

Step-by-step explanation:

A mother bottlenose ate about 220 pounds of food in one week. About how much food did she eat in a day?

She ate about
pounds of food in a day.

Answers

Answer: 31.42
if you get it wrong im so sorry

Jan found 24 bagels on sale for $9. She is planning to serve breakfast for her students and parents and needs 48 bagels. How much will she spend?

Answers

Answer:

$18

Step-by-step explanation:

9 multiplied by 2 equals 18.

Hope this helps :)

What is 2 ½ divided by ½ equal too

Answers

Answer:

it woulb be 1.25

Find the errors and correct the following mathematical sentences.​

Answers

Answer:

Step-by-step explanation:

18). 3x + 2 ÷ 3x = [tex]\frac{2}{3x}[/tex]

     Since, 3x + 2 ÷ 3x = 3x + [tex]\frac{2}{3x}[/tex]

      Therefore, right hand side of the equation will be = 3x + [tex]\frac{2}{3x}[/tex]

20). [tex]\frac{4x+3}{3}=x+1[/tex]

       Since, [tex]\frac{4x+3}{3}=\frac{4x}{3}+\frac{3}{3}[/tex]

                            = [tex]\frac{4}{3}x+1[/tex]

Therefore, right hand side of the equation should be [tex]\frac{4}{3}x+1[/tex].

10. Find the volume of the prism.
3 ft
7 ft
2 ft

Answers

Three times two is 6, times 7 is 42. That’s the answer.

7% interest on a loan of $800 for a year. how much will you receive?

Answers

Answer:

$56

Step-by-step explanation:

Here's an easy way to figure out this and any percentage question. One per cent (1 dollar out of $100) of $800 would be $8. So, if the man received 7 per cent out of $800, then just multiply $8 times 7, which is 56...so $56!

Hope it helps

Please mark me as the brainliest

Thank you

Step-by-step explanation:

Here's an easy way to figure out this and any percentage question. One per cent (1 dollar out of $100) of $800 would be $8. So, if the man received 7 per cent out of $800, then just multiply $8 times 7, which is 56...so $56

determine the measure of each angle: x,y and z
PLS HELP

Answers

Answer:

x=42°

y=64°

z=68°

Step-by-step explanation:

Consider the triangle towards the right with 90° and 48° marked. The other angles must equal 42° (angles in a triangle add to 180, 42+48+90=180). This 42° angle is vertically opposite x, so x=42°.

The triangle that contains z also contains the angle 22° and 90° (because it is on a straight line with another 90° angle and the angles along a straight line add up to 180 (90+90=180)). Since the angles in a triangle add to 180, z=68°. (68+22+90=180)

The angles z, 48° and y lie along a straight line. Since the angles along a straight line equal 180 and since we know that z=68°, we can say y=64° (68+64+48=180)

Answer:

Solve for x: (use triangle sum theorem)

48+90+x=180

x = 42 (vertical angles)

Solve for y: (Find z first, then use triangle sum theorem)

68+48+z=180

y = 64

Solve for z: (triangle sum theorem)

22+90+z=180

z=68

Part B: Which box-and-whisker plot displays
Mario's data?


Brainliest quick

Answers

Answer:

Step-by-step explanation:

i think it's D i have the same test today

Answer:

C cause it has to be 54 then the median is 58

Step-by-step explanation:

Use transformations of f(x) = x² to graph the following function.
g(x) = x² +5
Select all the transformations that are needed to graph the given function using f(x)= x?.
A. Shift the graph 5 units down.
B. Reflect the graph about the x-axis.
C. Shift the graph 5 units up.
D. Reflect the graph about the y-axis.
E. Shrink the graph vertically by a factor of 5.
F. Shrink the graph horizontally by a factor of 5.
G. Shift the graph 5 units to the left.
H. Shift the graph 5 units to the right.
I. Stretch the graph vertically by a factor of 5.
J. Stretch the graph horizontally by a factor of 5.

Answers

Answer:

C. Shift the graph 5 units up.

Step-by-step explanation:

vertical translation 5 units up

Robin made a cuboid of plasticine. Length, breadth, and height of the cuboid are
3 cm, 2cm, 3 cm respectively. How many such cuboids will he need to make a
perfect cube?

Answers

will need 18cm^3

Step-by-step explanation:

volume of cuboid = length × base × height

so v= 3cm ×2cm×3cm

v=18cm^3

Which graph represents the function f (x) = 3 x minus 2 Over x minus 2?

Answers

Answer:

C

Step-by-step explanation:

find the degrees of the marked angle​

Answers

Answer:

n=82

m=98

e=98

Step-by-step explanation:

n is vertical to 82

180-82=m and e because they are suplementery angles

Answer:

∠n = 82°

∠m = 98°

∠n = 98°

Step-by-step explanation:

∠n = 82° because it is alternate to 82°

total circle = 360°

∠l =∠m

2∠m = 360° - 82° - 82° = 196°

∠m = 98°

∠n = 98°

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