\left\{ \begin{array} { l } { 3 x - y = 7 } \\ { y = 5 } \end{array} \right.
Solve for x, y
x=4
y=5
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3x-5=7
Consider the first equation. Insert the known values of variables into the equation.
3x=7+5
Add 5 to both sides.
3x=12
Add 7 and 5 to get 12.
x=\frac{12}{3}
Divide both sides by 3.
x=4
Divide 12 by 3 to get 4.
x=4 y=5
The system is now solved.
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