The value of x in the system x - 3y = 7; 3x - 3y = 15
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Answer:
x-3y=7
x=7+3y
put value of x in
3x-3y=15
3(7+3y)-3y=15
21+9y-3y=15
6y=-6
y=-1
x=7+3y
=7-3
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