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Intermediate Algebra Topic 2g: Graphs
More on The straight line 1
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	Straight lines have equations of the form y=mx+c, where c is the "y-intercept", in other words the point where the line crosses the y-axis. m is the gradient of the line, which can be found from the graph by constructing a triangle as shown and measuring the "rise" and the "step". The gradient is given by "rise" divided by "step" Still need more explanation?