SOLUTION: the graphic 4x+y=1 y-x=-9
-> SOLUTION: the graphic 4x+y=1 y-x=-9
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4x+y=1 or y=-4x+1 (red line)
y-x=-9 or y=x-9 (green line)
(graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -4x +1 and x -9).