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°9 x plus 135 equals 1809 x°=180°9 x equals 1809x°−135°=180°9 x minus 135 equals 1809x°+135°=90°

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