Question

Given the following systems of equations match the first step needed to solve them by substitution. System A x - y = 12 2x - y =12 [ Select] [ Select] Solve the first equation for x, by adding y to both sides Solve the first equation for y. by adding x to both sides Solve the second equation for x by dividing it by 2 2x - y - 3 [ Select] To play audio version of question click the play button or click here

Answer 1

We are given the following system of equations:

`\begin{gathered} x-y=12,\text{ (1)} \\ 2x-y=12,\text{ (2)} \end{gathered}`

The first step to solve the system is to solve for "x" in the first equation, to do that we need to add y to both sides, like this:

`\begin{gathered} x-y+y=12+y \\ x=12+y \end{gathered}`