# core 1 coordinate geometry help!!!Watch

#21
(Original post by Robbie242)
You have two points You've being told that the gradient of the line l which passes through these two points is

Now the equation of a line is given by the formula This means that you can substitute any of the coordinates from either point to get the equation of l, so lets label A as the point well from the question and for the coordinates of A correct?

Substitute these into the formula along with m, expand and rearrange into the form
thnx
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#22
(Original post by BabyMaths)
Here's a simpler example. A line with gradient 2 passes through the point (4,9). Find the equation of the line in the form <br />
<br />
You already know the equation is and you know that when . <br />
<br />
You can use those values to find the value of c.<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />

thnx
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