\left\{ \begin{array} { l } { x + 4 = 1000 } \\ { x = 20000 y } \end{array} \right.
Solve for x, y
x=996
y=\frac{249}{5000}=0.0498
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x=1000-4
Consider the first equation. Subtract 4 from both sides.
x=996
Subtract 4 from 1000 to get 996.
996=20000y
Consider the second equation. Insert the known values of variables into the equation.
\frac{996}{20000}=y
Divide both sides by 20000.
\frac{249}{5000}=y
Reduce the fraction \frac{996}{20000} to lowest terms by extracting and canceling out 4.
y=\frac{249}{5000}
Swap sides so that all variable terms are on the left hand side.
x=996 y=\frac{249}{5000}
The system is now solved.
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