Question
Solve the system:$$\left\{\begin{aligned} x+y+2 z &=19 \\ y+2 z &=13 \\ z &=5 \end{aligned}\right.$$What makes it fairly easy to find the solution?
Step 1
$$ We can see that the third equation gives us the value of $z$ directly, which is $z=5$. Show more…
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