Question

Find the value of x :- x + y=3; x-y=-1 *
1)4
2)3
3)2
4)1​

Answer 1

Answer:

$given \\ x + y = 3 \\ x - y = 1 \\ on \: adding \: above \: equation \\ 2x = 4 \\ x = 2 \\ so \\ y = 1$

Answer 2

Answer:

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$x + y = 3 \: \: \: \: \: \: \: \: \: (1)\\ x - y = - 1 \: \: \: \: \: \: \: (2) \\ by \: (1) \: we \: get \\ x + y = 3 \\ x = 3 - y \: \: \: \: \: \: \: \: \: \: (3) \\ by \: (3) \: and \: (2)we \: get \\ 3 - y - y = - 1 \\ \longrightarrow \: 3 - 2y = - 1 \\ \longrightarrow \: - 2y = - 1 - 3 = - 4 \\ \longrightarrow \: y = \frac{ - 4}{ - 2} = 2 \\ putting \: y = 2 \: in \: (3) \: we \: get \\ x = 3 - y \\ \longrightarrow \: x = 3 - 2 = 1 \\ \\ \\ x = 1 \\ y = 2$