Two supplementary angles have the following measures: and . What is
the equation to solve for ? (1 point)
m∠ABC = 135° m∠CBD = 9x°
x
9x° + 135° = 90°
9x° − 135° = 180°
9x° + 135° = 180°
9x° = 180°
The equation to solve for x is:
9x° + 135° = 180°