how do you solve the following system by substitution4y=-5x , 5x+8y=20

solve system using any method

4y=-5x

5x+8y=20
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1 Answer

4y=-5x...8y=-10x or y=-(10/8)x

5x+8y=20

5x -10x=20

-5x=20

x=-4

y=-1.25x=+5
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