Question

The measures of the angles of a triangle are shown in the figure below. Solve for x.

(8x-9)°
63°
70°

Answer 1

x=7

Explanation:

63˚+70˚ = 133˚

180˚ - 133˚ = 47˚

(8x-9)˚ = 47˚

8x7=56

56-9=47˚

Answer 2

x = 7

Explanation:

(8x - 9)° = 180° - ( 70° + 63° )

8x - 9 = 47

8x = 47 + 9

x = 56 ÷ 8

x = 7