Answer:
x = 12.2; angles are 77.6 and 102.4 total to 180
Step-by-step explanation:
The equations they are giving you for the two angles he was correct about. When a line intersects two parallel lines, the angles on the opposite sides of the transverse line will equal 180 degrees.
So those two equations when added together must equal 180 degrees.
(5x + 16.6) + (9x - 7.4) = 180
Rearrange the equation
5x + 9x + 16.6 - 7.4 = 180
Add the x values together and subtract the regular numbers
14x + 9.2 = 180
Subtract 9.2 from both sides
14x = 170.8
Divide both sides by 14
x=12.2
The top angle in your drawing is 5x + 16.6 or
5 ( 12.2) + 16.6 = 77.6 degrees
The bottom angle in your drawing is 9x - 7.4 or
9 ( 12.2) - 7.4 = 102.4
Both angles added together is 77.6 + 102.4 = 180