Form the pair of linear equations in two variables from this situation by taking the cost of one notebook as Rs x and the cost of one pen as Rs y
1)3x+ 2y = 80 and 4x + 3y = 110
2)2x+ 3y = 80 and 3x + 4y = 100
3)x+ y = 80 and x + y = 110
4)3x+ 2y = 110 and 4x + 3y = 80
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