Which of the following is equivalent to -3x + 5 ≤ 20?

Subtract 5 from both sides of $-3x + 5 \leq 20$: $-3x \leq 15$. Divide both sides by $-3$ and reverse the inequality: $x \geq -5$, choice B. Test $x = 0$: $5 \leq 20$ is true, and $0 \geq -5$ is true. Choice A ($x \leq -5$) forgets to reverse the inequality. Choice C ($x \geq 5$) reverses the sign but loses the negative on the 5. Choice D ($x \leq 5$) drops both the sign flip and the negative. Whenever you divide or multiply by a negative number, flip the direction of the inequality.