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Use the following equation:

y = mx + c

where m = the gradient and c = the point at which the line intercepts the Y axis. M is calculated by Change in Y / Change in X... For example;

The line moves 3 'slots of y' and 5' slot of x' thus M = 3/5 = 0.6

thus y = 0.6*x + c

So if you want to know what y is when x is 5 for example, put five in the place of 'x', and put the point of intercept in as C.

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