You can put this solution on YOUR website! x + 7y = 6
7y=-x+6
y=-x/7+6/7
y=-x/7+6/7 (red line)
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x = 5 - 7y
7y=-x+5
y=-x/7+5/7 (green line) (graph 300x200 pixels, x from -6 to 5, y from -3 to 3, of TWO functions -x/7 +6/7 and -x/7 +5/7).
No intercept, thus no unique solution.
These are parallel lines.