Question

∠A and ∠B are supplementary angles. If m∠A = (3x+1)∘ and m∠B = (x-9)∘, then find the measure of ∠B.

Answer 1

Explanation:

Answer 2

X= 45

Explanation:

So you do

3x+1+x-9=180

Because supplementary angles are 180°

Then

3x+x = 4x

1 - 9 = -10

4x-10=180

4x-10+(10)=180+(10)

4x=190

x=45