Since both triangles ABC and PQR are congruent, this means that measure angle B = measure angle Q
Therefore:
3v + 4 = 8v - 6
4 + 6 = 8v - 3v
10 = 5v
v = 10/5 = 2
Therefore:
measure angle B = 3v + 4 = 3(2) + 4 = 6+4 = 10
measure angle Q = 8v - 6 = 8(2) - 6 = 16-6 = 10
You will find that the two angles are equal due to the triangles being congruent as mentioned before
