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°=180°

9x°=180°

9x°+135°=180°

9x°+135°=90°

The correct equation to solve for x is 9x°+135°=180°.