Question

What is the value of y?



Enter your answer in the box.

Answer 1

5

Explanation:

As seen in the figure, we know that because ΔABC is isosceles, ∠B = ∠C, so we know that 75 = 3x, x = 15. Next, following the rule that all angles in a triangle sum to 180°, we can set up this equation and solve it:

4y + 10 + 75 + 75 = 180

4y = 180 - 160

y = 20

∴ y = 5