Question

In ΔABC, m∠A=4x+7 and m∠B=5x−3. What is the m∠A?

Answer 1

5x-3+4x+7+90=180
9x-3+7+90=180
9x+94=180
9x=86
x=9.5555555555555555(etc)

Answer 2

Angle A = 47⁰

Explanation:

Angle A = Angle B { equal sides have equal angles. }

so,

4x + 7 = 5x - 3

7 + 3 = 5x - 4x

10 = x

so Angle A = 4x + 7 = 4(10) + 7 = 40 + 7 = 47⁰