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# Countdown to Exams - Day 47 - Equation of a straight line

Today we are looking the Equation of a straight line. Before we move onto the more complex straight line graphs, we must understand the equations of horizontal and vertical lines.

A horizontal line has the equation y =? where ? is the point the line crosses the y-axis. A vertical line has the equation x =? where ? is the point where the line crosses the x-axis.

All straight line graphs follow the general rule y = mx+c where m is the gradient (steepness) of the line and c is the y-intercept. You will need to be able to calculate gradients effectively and substitute into the general rule to find the y-intecept if you are given some coordinate points.

Matt covers the topic of straight line graphs in the video below.

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