Two angles, ∠1

and ∠2, in a diagram are supplementary. If m∠1=77°, what equation can you write to solve for m∠2? Let m∠2=x°
(1 point)
Responses

x°+77°=180°
x plus 77 degrees equals 180 degrees
x°+77°=90°
x plus 77 degrees equals 90 degrees
x°=77°
x equals 77 degrees
x°=90°−77°