\left\{ \begin{array}{l}{ n - y = 400 }\\{ y = 150 }\end{array} \right.
Solve for n, y
y=150
n=550
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n-150=400
Consider the first equation. Insert the known values of variables into the equation.
n=400+150
Add 150 to both sides.
n=550
Add 400 and 150 to get 550.
n=550 y=150
The system is now solved.
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