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D is the midpoint of AC. If AD = 2x + 6 and DC = 4x-7, what is the length of DC? A. 6.5 B. 7 C. 18 D. 19
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D is the midpoint of AC. If AD = 2x + 6 and DC = 4x-7, what is the length of DC?

A. 6.5
B. 7
C. 18
D. 19

User Evrim
by
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1 Answer

3 votes
A----------D----------C

AD = 2x + 6
DC = 4x - 7

the midpoint D splits AC into 2 equal parts....therefore, AD = DC

2x + 6 = 4x - 7
2x - 4x = -7 - 6
-2x = - 13
x = -13/-2
x = 6.5

DC = 4x - 7......4(6.5) - 7 = 19 <===
AD = 2x + 6.....2(6.5) + 6 = 19
User MaTHwoG
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