Solve for a
a\geq 50
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200-a-3a\leq 0
Subtract 3a from both sides.
200-4a\leq 0
Combine -a and -3a to get -4a.
-4a\leq -200
Subtract 200 from both sides. Anything subtracted from zero gives its negation.
a\geq \frac{-200}{-4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.
a\geq 50
Divide -200 by -4 to get 50.
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