Solve for r
r\leq 9
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-11-r\geq -20
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
-r\geq -20+11
Add 11 to both sides.
-r\geq -9
Add -20 and 11 to get -9.
r\leq \frac{-9}{-1}
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
r\leq 9
Fraction \frac{-9}{-1} can be simplified to 9 by removing the negative sign from both the numerator and the denominator.
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