3 years ago

What's the answer on number 11

1 answer:

6 0

2x-y=7
2x+7y=31 |* (-1)
===
2x - y = 7
-2x-7y=-31
===
-y-7y=-24
-8y=-24 |:(-8)
y=3

2x-y=7
2x-3=7 |+3
2x=10 |:2
x=5

x=5
y=3

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