Question 374319
3x - 9y = 9
-9y=-3x+9
y=-3x/-9+9/-9
y=x/3-1 (red line)
2x - 6y = -4
-6y=-2x-4
y=-2x/-6-4/-6
y=x/3+2/3 (green line)
 {{{ graph( 200, 200, -3, 5, -6, 5, x/3 -1, x/3 +2/3) }}} (graph 200x200 pixels, x from -6 to 5, y from -3 to 5, of TWO functions x/3 -1 and x/3 +2/3). 
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There is no unique solution to these 2 equations.