Question 536200
The equation 12-4x=0 defines the point x=3.
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If you meant 12y-4x = 0, then we have something to work with.
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12y = 4x
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y = 4x/12 = 1/3*x
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When x = 0, y = 0
When x = 6, y = 2
With two points you can draw a line.
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{{{ graph(500,500,-10,10,-10,10,1/3*x) }}}