\left\{ \begin{array} { l } { y = 2 x + 15 } \\ { x = 4 } \end{array} \right.
Solve for y, x
x=4
y=23
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\left\{ \begin{array} { l } { y = 2 x + 15 } \\ { x = 4 } \end{array} \right.
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y=2\times 4+15
Consider the first equation. Insert the known values of variables into the equation.
y=8+15
Multiply 2 and 4 to get 8.
y=23
Add 8 and 15 to get 23.
y=23 x=4
The system is now solved.
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