7x-y=9 9x-3y=3

Is the ordered pair a solution?
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1 Answer

line 1: 7x-y=9

line 2: 9x-3y=3   or 3x-y=1, so y=3x-1

line 1: 7x -(3x-1)=9

7x -3x+1=9

4x=8

x=2

y=3x-1=3*2 -1=6-1

y=5
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