in figure ab is parallel to CD if angle 2 is equal to 2 X + 30 angle 4 is equal to X + 2 Y and angle 6 is equal to 3 Y + 30 find angle 5
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Answer: Angle 5 is 50°.
Step-by-step explanation: angle 2 = angle 4 (vertically opposite angle)
2x+30 = x+2y
2x-x = 2y-30
x = 2y-30 - equation 1
angle 4 = angle 6 (alternate interior angles)
x+2y = 3y+10
x = y+10 -equation 2
comparing equations 1 and 2
2y-30 = y+10
y = 40°
angle 5 + angle 6 = 180° (linear pair)
angle 5 + 3y+10 = 180°
angle 5 + 3(40°) +10 = 180°
angle 5 + 120° +10 = 180°
angle 5 + 130° = 180°
angle 5 = 180° - 130°
angle 5 = 50°
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