solve the inequality 1 - 3x ≤ 7
Add 3x to both sides
1 ≤ 7 + 3x
Subtract 7 from both sides
-6 ≤ 3x
Divide both sides by 3
-2 ≤ x
This says x must be greater than or equal to -2, so it can also be written as x ≥ -2
.