Find the ratio in which the line 3x + y - 9 = 0 eivides the line segment joining the points (1,3) and (2,7).
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3x+y-9=0
3x+y=0+9
3x+y=9
x+y=9÷3
x+y=3
3x+y=0+9
3x+y=9
x+y=9÷3
x+y=3
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