Question

For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

2x + y = 8
−x − y = −5

8 + 2x

8 − 2x

−8 − 2x

−8 + 2x

Answer 1

You just subtract 2x from both sides in the first equation.

\( \color{Black}{\Rightarrow \cancel{2x} + y \cancel{- 2x} = 8 - 2x}\)

Answer 2

8-2x .....by substracting 2x on both sides...