Question

What does B equal ????

Answer 1

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Answer 2

The angle A is equal to B because they are opposite angles by the vertex.

So...

5x - 15 = 2x + 21

For solve it, we are going to do the same operations in both sides of the equal sign. We need put all the X in a side of the equal sign and all the free numbers in the other side.

5x - 15 = 2x + 21

We are going to add 15

5x - 15 + 15 = 2x + 21 + 15

5x = 2x + 36

We are going to substract 2x

5x - 2x = 2x + 36 - 2x

3x = 36

We are going to divide by 3

3x/3 = 36/3

x = 12

X = 12

and

B = A