GCSE Maths

Higher or Lower Graphs

x-y sketch

Another way of drawing different x-y graphs is to make the line higher or lower than y=x:

graphs of y=x + or - a bit!

The green line y=x+3 above is higher up than the line y=x because each value of y on the line is 3 more than that of x.

However, the blue line y=x-2 above is lower down than the line y=x because each value of y on the line is 2 less that of x.

The number after x in the formula tells us how high the line will be. Positive values raise the line, negative values lower it.

N.B. Notice that all three lines above have the same gradient.


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