Question
Solve using the substitution method.$$\begin{array}{c}x+y=9 \\2 x-3 y=-2\end{array}$$
Step 1
Let's call the first equation (1) and the second equation (2). So, we have: \begin{align*} x+y &= 9 \quad \text{(1)} \\ 2x-3y &= -2 \quad \text{(2)} \end{align*} Show more…
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