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Quadratics

Review question

Can we fit a quadratic to this given data?

Ref: R8775

In the above table the values of y were calculated from a formula y=Ax2+Bx, where A and B are constants. One of the values of y, however, has been deliberately misprinted.

Plot the values of y/x against those of x, …

Why does the question ask us to use y/x rather than y?