Multiple choice If 3k - 21 = 6k - 42, then the value of z in 2z + 2 = k will be 5 9 5 2.5 None of these Reveal answer Fill a bubble to check yourself D Correct answer Explanation 3k - 21 = 6k - 42 Or 3k = 21 Or k = 7 Now, 2z + 2 = k Or 2z + 2 = 7 Or 2z = 5 Or z = 2.5