Question
Solve each system in terms of the arbitrary variable z. See Example 7.$$\begin{aligned}&5 x-4 y+z=9\\&y+z=15\end{aligned}$$
Step 1
Let's call the first equation (1) and the second equation (2). So, we have: \begin{align*} 5x - 4y + z &= 9 \tag{1} \\ y + z &= 15 \tag{2} \end{align*} Show more…
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