Answer:
(D) 3x +6 ≤ 3
Explanation:
Since there is a solid dot at x=-1, the inequality must include "≤", which eliminates the first two choices.
You can check x=-1 in each of the remaining choices to see which results in the "equal to" case.
2(-1) +5 ≤ 1 . . . . . choice C
3 ≤ 1 . . . . . . . . . . .not true
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3(-1) +6 ≤ 3 . . . . . choice D
3 ≤ 3 . . . . . . . . . . true; the "equal to" case we're looking for