All graphs are drawn on axes called x (horizontal) and y (vertical). Remember them this way: x is a cross: across!
The simplest graphs are numbers only. e.g. y=4 or x=-2
The axes are special lines: y=0 and x=0 for the x- and y-axis respectively!
Straight line graphs take the form y=±mx±c where m is the gradient and c is the y-intercept.
The gradient is how steep the graph is. Negative gradients slope down.
The y-intercept is where the line crosses the y-axis.
Work out how to plot graphs using 3 pairs of values for x and y.
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