Question

anwer is 60 but i need a step by step explanation!​

Answer 1

Answer:

x = 60

Step-by-step explanation:

Since angle 5y and angle 7y are on the straight line,

5y + 7y = 180 (angles in a straight line add up to 180)

12y = 180

y = 15

Since ABC is a triangle

angle A + angle B + angle C = 180 (angles in a triangle are equal to 180)

3y + x + 5y = 180

x + 8y = 180

Subsititute y = 15 in the equation above

x + 8 (15) = 180

x + 120 = 180

x = 180 - 120

x = 60

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