You can put this solution on YOUR website! First, get it in y = mx+b format so that you can graph it.
5x + 4y = 20
subtract 5x from both sides
4y = -5x + 20
divide both sides by 4
y = -5/4x + 5
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x = 0, y = 5 results in the point (0,5)
x = 4, y = 0 results in the point (4,0)
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with two points you can graph a straight line
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