Question

What is the first step to solve the following system of equations using substitution?

x - y = 7
2x - y = 17

Answer 1

Solve one of the following equations for x or y and then substitute the answer to that equation into the second equation.

Explanation:

Given the system of equations:

`x-y=7`

`2x-y=17`

You could solve either one of the given equations but for this question we will solve the first equation.

`x-y=7`

Solve for x

Subtract y

`x=5-y`

Now substitute the answer for the first equation into the second equation.

Hope this helps.