Question 33863
x+2y=15   --- eq 1
x-2y=-9   --- eq 2
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2x = -6       (adding eq1 and eq2)
x = -6/2 = -3

substitute value of x in eq 1
2y = 15 - x
2y = 15 - (-3)
2y = 15+3 = 18
y = 18/2 = 9

x = -3; y = 9