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31-01-2018
Mathematics

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What is the value of x?

A. 5
B. 2.5
C. 7.5
D. 10

What is the value of x A 5 B 25 C 75 D 10 class=

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zhaotianyu369 zhaotianyu369

31-01-2018

The two lines are horizontal, so the two triangles in the diagram are similar because their internal angles are the same. By the proportionality of similar triangles, x/(x+5)=(x-2)/(x+1). Solve the equation, x^2+x=x^2+3x-10, x=3x-10, x=5.

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