\left\{ \begin{array} { l } { x = - 15 } \\ { x + y = 20 } \end{array} \right.
Solve for x, y
x=-15
y=35
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-15+y=20
Consider the second equation. Insert the known values of variables into the equation.
y=20+15
Add 15 to both sides.
y=35
Add 20 and 15 to get 35.
x=-15 y=35
The system is now solved.
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