Answer: a. these two are vertical angles meaning they are equal but opposite angles.
b. knowing they are equal, we can set up an equation. 8x - 5 = 6x + 15
8x - 5 = 6x + 15
8x = 6x + 15 + 5
8x = 6x + 20
8x = 20 + 6x
8x - 6x = 20
2x = 20
x = 10
Let us check using substitution. 8 * 10 - 5 = 6 * 10 + 15
75 = 75
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