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Katen [24]
3 years ago
8

What is the value of x and what is the value of y in these equations (x in both has to be the same number, likewise for y)?

Mathematics
1 answer:
katrin2010 [14]3 years ago
7 0
To answer this, you should "subtract" x+y=7 from 3x+y=45.

What is left is 2x=38, where x then equals 19.

Plug this value into any of the equations (I will choose x+y=7 for simplicity).

19+y=7, y=-12

Check this answer by plugging it into the other equation.
3(19) + (-12) =45
45=45 so it is correct

X=19 and Y=-12
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Every day after school, Kelly and Bella walk their dogs around the block. The block is 274 meters long and 80 meters wide. What
trapecia [35]

Answer:

708meters

Step-by-step explanation:

Given data

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substitute

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4 0
3 years ago
A class has 16 boys and 24 girls.Of the 16 boys ,3 are left handed.Of the 24 girls, 2 are left handed.If a student is chosen at
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Answer:

1/8

Step-by-step explanation:

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3 0
3 years ago
Read 2 more answers
What is the sum of the coefficients in the expression below?<br> 22°y2 + 5x+ y2 - 6xy' +7
schepotkina [342]

Answer:

485y to the power 2 + 5x to the power 2 - 6xy to the power 3 + 7

Step-by-step explanation:

I hope this helps. Also, there's this free app called Quick Math. If you need the steps, you should check there first, and maybe you should try that for other math problems as well.

Good luck and have a great rest of your day.

8 0
3 years ago
Find the value of x. Explain your answer.
KatRina [158]

Answer:

x = (-9)

Step-by-step explanation:

From the diagram, we see that the triangle is an isosceles triangle. Since it is an isosceles triangle we know that the angles at the base of an isosceles triangle are equal to each other, so the angles that is not marked will be equal to m∠2. Since now we know that, we can make the following equation...

m∠2 + m∠2 + 84 = 180

Now we solve it and get...

2(m∠2) = 180 - 84

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Now we substitute m∠2 with x + 57, and get...

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5 0
3 years ago
I need help really bad
Stella [2.4K]
The answer is 18.  You add 5  to both sides of the equation. the 5 cancels out.  You are left with 2/3x=12.  Then you divide 12 by 2/3 to get x.  12 divided by 2/3 is 18
5 0
4 years ago
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