Question

find a if one angle of a supplementry angle is 2y-20 and another is 2y+60

Answer 1

2Y - 20 + 2Y + 60 = 180

4Y + 40 = 180

4Y = 180 - 40

4Y = 140

Y = 35

aNGLE = 70 - 20 = 50

another angle = 70 + 60 = 130

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Answer 2

since supplementary angles are 180

therefore 2y-20+2y+60=180

4y+40=180

4y=180-40

4y=140

y=140\4=35

now 2y-20=2*35-20=70-20=50

2y+60=2*35+60=70+60=130

therefore the two angles are 50 and 130

you can check

130+50=180