nfruel
nfruel nfruel
  • 26-10-2017
  • Mathematics
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Please help explanation needed 42 points

Please help explanation needed 42 points class=

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Catya
Catya Catya
  • 26-10-2017
alternate interior angles means the angles across from another are equal. If you follow the line up 85 is directly across from 2x+1
then you can say
85 = 2x +1
85 -1 = 2x
84 = 2x
84/2 = x
42 = x

supplementary angles make a straight line so they must add to equal 180 degrees.
That means the other angle 3y+5 = 180-85
3y +5 = 95
3y = 95-5
3y = 90
y = 90/3
y = 30
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