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°

Responses:
x°+77°=90°
x°=90°−77°
x°+77°=180°
x°=77°

1 answer

The correct equation to solve for m∠2 is:

x° + 77° = 180°