Question
Solve the system of equations.$$\begin{array}{rr}x-y-z= & -11 \\x+y-z= & 15 \\2 x-y+z= & -9\end{array}$$
Step 1
This gives us: $$2x - 2z = 4$$ Simplifying this, we get: $$x - z = 2 \tag{4}$$ Show more…
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