You can put this solution on YOUR website! y is less than or equal to 1/4x
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y <= (1/4)x
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If x = 0, y = 0 giving you point (0,0)
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If x = 4, y = 1 giving you point (4,1)
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Plot the two points and draw a line thru them to get:
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Cheers,
Stan H.