What is the first step in solving the following system of equations? 3 x plus y is equal to 23 8 x plus 2 y is equal to 23

The first equation, 3x + y = 23, is easy to rearrange to isolate y: y = 23 − 3x. Then you can substitute that expression into the second equation. So the first step is to solve the first equation for y, choice D.

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