solve completely. .............
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Answer:
y=3x+7
y-7=3x
x=(y-7)/3
y=4(x-3)+4
y=4x-12+4
y=4x-8
sub x
y=4((y-7)/3)-8
y=(4(y-7))/3-8
y=(4y-28)/3-8
3y/3=(4y-28)/3-24/3
3y=4y-28-24
52=7y
y=52/7
x+y=(y-7)/3+52/7
x+y=(7(y-7))/21+(3x52)/21
x+y=7y+3
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