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3 years ago

Solve the system of equations by the substitution method. y=5x+6 y=9x+7

Mathematics

1 answer:

alukav5142 [94]3 years ago

8 0

Answer:

When finding the value of x let y be 0 and when finding value of y let x be 0 and get your answers.

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<img src="https://tex.z-dn.net/?f=5%20%7Bx%7D%5E%7B2%7D%20%20-%202x%20%2B%203x%20%3D%209%20%7Bx%7D%5E%7B2%7D%20%20%2B%209x" id="

sashaice [31]

Answer:

$5 {x}^{2} - 2x + 3x = 9 {x}^{2} + 9x \\ 5 {x}^{2} + x = 9 {x}^{2} + 9x \\ 5 {x}^{2} - 9 {x}^{2} = 9x - x \\ - 4 {x}^{2} = 8x \\ - 4x = 8 \\ x = \frac{ - 8}{4} = - 2 \\ x = - 2 \\ thank \: you$

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Can some help ...:.....0

frozen [14]

Answer:

-4

Step-by-step explanation:

Two legs of the triangle are congruent as shown by the tick marks. This means that this is an isosceles triangle; in an isosceles triangle, the two base angles are also congruent. Which means <A and <B are congruent.

So to solve for x, set 28 and 10x+68 equal to each other.

28=10x+68

First, subtract 68 from both sides

-40=10x

Then, divide both sides by 10

-4=x

If you want to check your answer plug -4 back into the original equation.

28=10(-4)+68

28=-40+68

28=28, which is true, therefore -4 is correct.

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