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3 years ago

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

Mathematics

2 answers:

Dominik [7]3 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]3 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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