Answer:
y = - 1
Explanation:
x + y = 1 .......... (1)
x - y = 3 .......... (2)
(1) + (2)
2x = 4 ⇒ x = 2
2 + y = 1 ⇒ y = - 1
(2, - 1)
y= -1
subtract, so x cancels out.
you are left with 2y=-2
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