Question

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Answer 1

1) x+y=7

x-y=1

2x=8 | x=8/2 | x=4

2)x+y=10

x-y=2

2x=12 | x=12/2 | x= 6

3) x+y=4

x-y=0

2x=4 | x=4/2 | x=2

4)x+y=6

x-y=4

2x=10 | x=10/2 | x=5

5)x+y=9

x-y=3

2x=12 | x=12/2 | x=6

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