I'm not sure if there is a specific way you need to do this, but.....
You could do:
(x - 3)° = 74°
Because you know that the 2 lines are parallel and the angles should be the same
x - 3 = 74 Add 3 on both sides
x = 77°
A straight line is 180°. The angles (x - 3)°, 41°, and (y + 8)° make up this 180° angle, so you could do:
(x - 3) + 41 + (y + 8) = 180
Since you know the angle of (x - 3), you can replace (x - 3) with 74
74 + 41 + (y + 8) = 180
115 + y + 8 = 180
123 + y = 180 Subtract 123 on both sides
y = 57°