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allsm [11]
2 years ago
14

I need help !!!!!!!!!!!!!!!

Mathematics
2 answers:
Dominik [7]2 years ago
4 0
Because \angle A and \angle B are alternate exterior angles, this means they <span>congruent or equal to each other.
</span>
Therefore, we can say 5x-15 = 2x+21 and use this equation to solve for x.
5x-15 = 2x+21
5x = 2x+36
3x = 36
x = 12
So x is equal to 12. After finding this, we can now go back to the equation for \angle B and plugin x to solve it.
\angle B = 2x +21

\angle B = 2(12) +21
\angle B = 24 +21
\angle B = 45
Therefore, \angle B is equal to 45 degrees.


koban [17]2 years ago
3 0
Angle B= 45 degrees
Angle A = 45 degrees

A and B are congruent since they are alternate exterior angles
5x-15 = 2x +21
5x = 2x +36
3x=36
X=12
B)
2x12+21 = 45
A)
5x12-15 =45
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