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90-(3x+20)=5x-8=>70 -3x=5x-8=>78=8x=>x=9.75°.
Since the sum of angles at p =90°.
Since the sum of angles at p =90°.
abdul5744:
not right answer
sum of angles is =180
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Since the two lines are parallel, the two interior angles add up to 180:
⇒ (3x + 20) + (5x - 8) = 180
Solve for x:
(3x + 20) + (5x - 8) = 180
3x + 20 + 5x - 8 = 180
8x + 12 = 180
8x = 168
x = 21
Answer: x = 21
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