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