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–3x – 5 = –20

–3x – 5 ≤ –20

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John R. | John R: Math, Science, and History TeacherJohn R: Math, Science, and History Teach...
4.6 4.6 (55 lesson ratings) (55)
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-3x - 5 ≤ -20                  Given

-3x - 5 + 5 ≤ -20 + 5       Add 5 to each side

-3x ≤ -15                       Simplify

-3x/(-3) ≥ -15/(-3)         Divide by -3 (Always reverse direction of inequality when dividing by a negative)

x ≥ 5                             Simplify

 

Anneliese A. | Proof-reading and writing improvement - fast, thorough, and reliableProof-reading and writing improvement - ...
5.0 5.0 (39 lesson ratings) (39)
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Solve inequalities very similarly to how you solve equations

-3x - 5 ≤ -20                       +5 to both sides
-3x ≤ -15                            ÷-3 to both sides (note that when dividing or multiplying both sides of an inequality by a negative number, you must flip the inequality sign)


x ≥ 5