What is the value of y?
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y =
2 answers:
since this is an isosceles triangle
5x =40
divide by 5
x=8
the sum of all angles in a triangle is 180
5x+40 + 2y+20 = 180
substitute 40 in for 5x
40 + 40 + 2y+20 = 180
combine like terms
100 + 2y = 180
subtract 100 from each side
2y = 80
divide by 2
y= 40
Y=40 because x=8 making the two bottom angles 40 each and leaving the last angle to be 100 and 100+40+40= 180. Hope this help
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