Question

Solve for y. Enter your answer in the box. An equilateral triangle A B C. Side B C is the base. Sides A B, B C, and A C are equal. Sides A B, B C, and A C are labeled with single tick marks. Angle A is labeled as left parenthesis 5 y plus 10 right parenthesis degrees, and angle C is labeled as left parenthesis 6 x plus 6 right parenthesis degrees.

Answer 1

y = 10

Explanation:

By definition, the internal angles of an equilateral triangle are all 60. So:

A = 5y + 10 = 60

5y + 10 = 60

5y + 10 - 10 = 60 - 10

5y = 50

5y/5 = 50/5

y = 10