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lidiya [134]
3 years ago
5

A and B are vertical angles. If A = 4x - 10 and B = 6x - 30, find mA.

Mathematics
2 answers:
Andru [333]3 years ago
5 0
<span>vertical angles
m<A = m<B
so
</span>4x - 10 = <span>6x - 30
6x - 4x = -10 + 30
2x = 20
x = 10

m<A = </span><span>4x - 10
</span>m<A = 4(10) - 10
m<A = 40 - 10
m<A = 30<span>

</span>
Dovator [93]3 years ago
5 0
If A and B are vertical angles, then A = B.  Thus, 4x - 10 = 6x - 30, and 10 = x.  Check:  Does 4(10) - 10 = 6(10) - 30?  Does 30 = 30?  YES.  So x = 10 is correct.  The measure of angle A is 30 degrees.
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