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x - 3y = -1
---------------- +
-y = -2
y = 2
-x +2(2) = -1
-x = -1 + 4
x = 3
b) 5x +3y = 30
3x +3y = 18
-------------------- -
2x = 12
x = 6
3(6) + 3y = 18
3y = 0
y = 0