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To find out which of the numbers 6, 7, and 8 is a solution of the inequality 3x ≤ 18, we need to substitute each number into the inequality and check if the inequality is true.
1) If x = 6:
3(6) ≤ 18
18 ≤ 18 (True)
2) If x = 7:
3(7) ≤ 18
21 ≤ 18 (False)
3) If x = 8:
3(8) ≤ 18
24 ≤ 18 (False)
So, the number 6 is a solution of the inequality 3x ≤ 18.