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B is the midpoint of ac find the length of ac. AB = 5x+9 and BC = 8x-36, A. 15 B. 84 C. 136 D. 168

B is the midpoint of ac find the length of ac. AB = 5x+9 and BC = 8x-36, A. 15 B. 84 C. 136 D. 168
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B is the midpoint of ac find the length of ac. AB = 5x+9 and BC = 8x-36, A. 15 B. 84 C. 136 D. 168

User Thib L
by
8.3k points

1 Answer

5 votes
5x + 9 = 8x - 36
9 = 3x - 36
45 = 3x
15 = x


5x + 9 = 8x - 36
5(15) + 9 + 8(15) - 36 = ac
75 + 9 + 120 - 36 = ac
168 = ac

D is the correct answer
User Gijs Brandsma
by
7.8k points
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