VictoriaRose1 VictoriaRose1
  • 25-01-2017
  • Mathematics
contestada

check my answer please

check my answer please class=

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helpmetnx helpmetnx
  • 25-01-2017
so it is an isosceles triangle that means that the bottom two angles are equal...
so 
40 = 5x 
divide both sides by 5 and you get 8

now the triangle angles add up to 180
we make an equation out of it...
(2y + 20 ) + ( 5(8)) + 40 = 180
2y + 20 + 40 + 40 = 180
combine like terms
2y + 100 = 180
so subtract 100 from both sides
2y = 80
divide by 2 to isolate the variable
y = 40

You are correct!!! :)
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