The gradient of a line tells us how steep the line is. Lines going in this / direction have positive gradients, and lines going in this \ direction have negative gradients.
The gradient can be found by finding how much the line goes up - the rise, and dividing it by how much the line goes down - the run. Hence, the equation for the gradient = rise / run, or gradient = change in y / change in x.
To find the rise and the run, you just take two points on the graph and see how much the line goes up (rise) and along (run) between these two points.
You need to know how to find the gradient of a straight line so that you can go on to find the full equation of the straight line.
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