Answer:

most likely (b). 32°;

Step-by-step explanation:

4x° + 5y° = 180°

Solve this linear equation for "y"

5y° = - 4x° + 180°

y° = - + 36°

y-intercept is 36° if x = 0°

It can be:

(a). y = 28°, then x = 10°  

(b). y = 32° , then x = 5° (In this case picture is not in scale, because angle 3y will be obtuse)