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The linear function has the form y=mx+b, which I expect you have heard of. The 'b' is the y-intercept, and the 'm' is the slope.

A constant of proportionality is something you have with direct variation, which is where the line goes through (0,0). This happens when 'b' equals zero.

So now the equation is just y=mx, and the constant of proportionality is 'm'.

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12y ago

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