\{ 4 x + 10 y = 31000
Solve for x
x=-\frac{5y}{2}+7750
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4x=31000-10y
Subtract 10y from both sides.
\frac{4x}{4}=\frac{31000-10y}{4}
Divide both sides by 4.
x=\frac{31000-10y}{4}
Dividing by 4 undoes the multiplication by 4.
x=-\frac{5y}{2}+7750
Divide 31000-10y by 4.
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