Truthfully? Since it isn't possible to do what you have suggested, you may wish to review what it is you have been asked to do.
Can you supply the COMPLETE problem statement rather than your abbreviated version?
Ok here's the whole question:
In an experiment, sets of values of the related variables (x,y,) are obtained. State how you would determine whether x and y were related by a law of the form:
where in each case, a and b are unknown constants. State briefly how you would be able to determine the values of a and b for each law.