Question

{×+y =4{2×+y=7

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Answer 1

{×+y =4

{2×+y=7

x = 4 - y

2 × ( 4 - y ) + y = 7

8 - 2y + y = 7

8 - 7 = 2y - y

1 = y

y = 1

x = 4 - y

x = 4 - 1

x = 3