x & y
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If you are given 2 data points, you can do (y1-y2)/(x1-x2) with the points. Given two intercepts, you can assume points based on the intercepts (if the x-intercept is 7, then one data point is (7,0). Then you can do the above once you do the same for the y-intercept.
The y-Variable
The data points would be .4 and .21
Interpolation is a method of constructing new data points within the range of a discrete set of known data points. Basically it's a way of estimating certain values, based on information that is already given.
= -1 + 5x