y-3x+6y=12
7y=3x+12
y=3x/7 +12/7
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3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
-9
x . 9 =12-3x9x =12-3x9x+3x=1212x =12x =1
3x + 2 = -10 3x = -12 x = -4
all you do is subtract the 3x from both sides and you get:y = -3x + 12