Use the figure alongside to find the value of y in terms of x. Calculate y, if x =5∘
A
y=3x+35 and y=20∘
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B
y=3x+35 and y=50∘
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C
y=3x+35 and y=40∘
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D
y=3x+35 and y=90∘
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Solution
The correct option is By=3x+35 and y=50∘ From the figure, Exterior angle = Sum of interior angles (Using exterior angle Property) 2y−x=y−5+2x+40 2y−x=2x+y+35 y=3x+35 If x=5 y=15+35=50∘