Question

In the accompanying diagram, line a intersects line b.

Answer 1

C. 10

Explanation:

`(x + 5) = (2x - 5)` (vertical angles are congruent)

`x + 5 = 2x - 5`

Add 5 to both sides

`x + 5 + 5 = 2x`

`x + 10 = 2x`

Subtract x from both sides

`10 = 2x - x`

`10 = x`

`x = 10`