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

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

asked
User Swandog
by
7.7k points

1 Answer

4 votes
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
2x+5y=20. , -2x+20y=-90. one solution. infinity many ir no solution. use elimination-example-1
answered
User Pedrog
by
8.4k points
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