Equation (eq)

L2MAEL

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Equation:

The generic equation formula is:

$$y=mx+c$$

where $m$ is the gradient and $c$ is te $y$-intercept.

In L2 CoordGeo, this formula must be used, and will be the only formula given to you in the exam:

$$y-y_1=m(x-x_1)$$

where the $m$ is the gradient, and $y_1$ and $x_1$ represent a coordinate from the same point.

You can calculate $m$ by using the gradient formula (above).

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Equation of a line Passing (x,y)

When it is asked to find an equation of a line passing somewhere, this means that the gradient is given in some way.

Since you have the gradient $(m)$, you can substitute the $x$ and $y$ values into your equation using the equation formula:

$$y-y_1=m(x-x_1)$$

..to find out the equation.