Answer:
b
Step-by-step explanation:
The top vertex of the triangle on the right is 51° ( alternate angle to 51°
The sum of the 3 angles in a triangle = 180° thus
51 + 72 + y - 6 = 180 , that is
y + 117 = 180 ( subtract 117 from both sides )
y = 63 , then
y - 6 = 63 - 6 = 57
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x - 5 , 51 and y - 6 lie on a straight line , therefore
x - 5 + 51 + y - 6 = 180
x - 5 + 51 + 57 = 180
x + 103 = 180 ( subtract 103 from both sides )
x = 77
Thus x = 77 , y = 63 → b
