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The question gives a gradient, $2$, and a coordinate, $(0,-1)$, which the line slopes through. Essentially I need to put this into an equation: $$y=mx+c.$$

I understand that it would be $y=2x+c$, but what is $c$? Furthermore how do I work it out from just $1$ coordinate given?

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How do you mean 'just 1 coordinate given'? –  Berci Nov 10 '12 at 14:53

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Oh, very easy. That the point with coordinates $(0,-1)$ lies on the line, means exactly that substituting $x=0$ and $y=-1$ in the equation of the line will give a true sentence: $$-1=2\cdot 0+c$$

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