What is the result of substituting for y in the bottom equation? y = x – 7 y = x^2 + 2x – 4 a. x – 7 = x^2 + 2x – 4 b. y = (x – 7)^2 + 2(x – 7) – 4 c. x – 7 = x^2 d. y = x^2 + 2x – 4 – (x – 7)

The answer is the option A, which is: A. x-7=x²+2x-4
 The explanation is shown below:
To solve this problem you must apply the proccedure shown below:
 1. You have the following system equations given in the problem above:
 y=x-7
 y=x²+2x-4
2. Therefore, when you substitute for y in the bottom equation, you obtain:
 x-7=x²+2x-4

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