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03-04-2019
Mathematics

contestada

2x+5y=20. , -2x+20y=-90. one solution. infinity many ir no solution. use elimination to find your answer

Respuesta :

03-04-2019

2x+5y=20
X=10-2.5y

-2(10-2.5y)+20y=-90
-20+5y+20y=-90
25y=-70
Y=2.8

2(2.8)+5y=20

5.6+5y=20
5y=14.4
Y=2.88

CHECK:
2(2.8)+5(2.88)=20

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