Find the solution to the system of equations given below using substitution.

a. x = -1, y = -7
b. x = 7, y = -1
c. x = 7, y = 1
d. x = -1, y = 7

OPTION D

Step-by-step explanation:

You can apply the SUBSTITUTION method:

- Solve for x from the second equation and substitute it into the first equation.

- Solve for y:

- Substitute y=7 into any of the original equations ans solve for x. Then:

The answer is:

D.

Substitution method for solving system of equations consists in isolate one variable in terms of the other variable.

So, isolating x in terms of y from the second equation, we have:

Then, substituting x into the first equation, we have:

Now, substituting y into the second equation we have:

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