We cannot say anything because the value of x and y can be any thing.
if x and y are 4,0 or 0,3 respectively then it is equal.But u can find many such values for 3x+4y=12.there are infinite values for 3x+4y<12 and 3x+4y>12
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y-3x+6y=12 7y=3x+12 y=3x/7 +12/7
6-3x+12=0 6+12-3x=0 18-3x=0 18=3x x=6
15
all you do is subtract the 3x from both sides and you get:y = -3x + 12
3x + 8 = 20 3x = 20 - 8 3x = 12 3x = 12/3 x = 4