Algebra-1

The correct first step in solving the system of equations by substitution is option A: -7(2y+11) - 2y = -13.

To solve the system of equations, we will use the fact that x is already isolated in the first equation, x = 2y + 11.

Let's go through the process step by step to understand why. We start with the system of equations:

x = 2y + 11
-7x - 2y = -13

In order to substitute the expression for x in the second equation, we need to substitute the value of x from the first equation, which is 2y + 11.

Substituting x = 2y + 11 into the second equation, we have:...