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how do i solve -2x+8y=-8, 5x+8y=20 using elimination

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ameliaswan
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Answer:

-2x+8y=-8...........(1)

5x+8y=20

5x=20-8y

x=(20-8y)/5.........(2)

Step-by-step explanation:

putting the value of x in equation (1)

-2(20-8y)/5+8 y=-8

(-40+16 y )/5=-8-8y

-40+16 y=(-8-8y)×5

-40+16 y=-40-40y

40y+16y=40+40

56y=80

y=80/56=20/14=10/7

again

putting the value of y in equation (2)

x=(20-8×10/7)/5=(20-80/7)/5=(140-80)/7×1/5=60/35=12/7

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