1. MGSE.9-12.G. C. 2 A GRV is inscribed in a circle as shown the figure below. In AGRV, GR is congruent to GV. What is the
measurement of GR?
G
/200
A. 20°
B. 160°
C. 130°
D. 700

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180