Question

ZA and ZB are supplementary angles. If m/A= (7x - 20)° and

m/B = (2x - 7)°, then find the measure of ZB.

Answer 1

Measure of angle B = 39

Explanation:

(7x-20) + (2x-7) = 180 (combime like terms)

9x - 27 = 180 (move 27 to the other side)

9x = 207 (divide both sides by 9)

x = 23

2x - 7 (subsititute x with 23)

2 (23) - 7

46 - 7

39

measure of angle b = 39