Algebra and Up:
Question: In the figure below, AG is a line and the measure of x is two times the measure of y. What is the value of y?
Answer: 40°
Solution: Since AG is a line, 6z = 180°. So, z = 180° ÷ 6 = 30°. We also know that x + y + 2z = 180°, or x + y + 60 = 180°, or x + y = 120°. If x = 2y, then we can conclude that 3y = 120°. So, y must be 120° ÷ 3 = 40°.
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