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The y-intecept is where the graph of the equation crosses the y-axis. In other words, it occurs where x=0.

For y=kx, the y-intercept is 0, not k. Substitute 0 for x, and y=0.

In an equation of the form y=ax+b, then the y-intercept is b, and the x-intercept is -b/a.

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Q: Why is k the y-intercept in y equals k x?
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