Solve for x
x\geq 0
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-7x+28-28x\leq 28
Subtract 28x from both sides.
-35x+28\leq 28
Combine -7x and -28x to get -35x.
-35x\leq 28-28
Subtract 28 from both sides.
-35x\leq 0
Subtract 28 from 28 to get 0.
x\geq 0
Product of two numbers is ≤0 if one is ≥0 and the other is ≤0. Since -35\leq 0, x must be ≥0.
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