Answer:
A. y = x + 10
Step-by-step explanation:
Given;
- The equation y = -7x - 5
- and another equation have a solution of (-2, 9)
If we equate the value of y in the first equation and the value of y in the second equation, then the solution of x should be -2 . Let's test this with equation A:
-7x - 5 = x + 10
-7x - x = 10 + 5
-x = 15
x = (15 × -2) ÷ 15 = -2
*<em>This proves that equation A has the same value of x as our first equation!</em>
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Let's test if equation A has a solution; y = 9:
y = (-2) + 10 = 9
*<em>This proves that equation A has the same value of y as our first equation!</em>
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So the second equation is,
A. y = x + 10
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