\left\{ \begin{array} { l } { x = 2 y } \\ { y = 4 } \\ { z = x + y } \end{array} \right.
Solve for x, y, z
x=8
y=4
z=12
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x=2\times 4
Consider the first equation. Insert the known values of variables into the equation.
x=8
Multiply 2 and 4 to get 8.
z=8+4
Consider the third equation. Insert the known values of variables into the equation.
z=12
Add 8 and 4 to get 12.
x=8 y=4 z=12
The system is now solved.
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