It doesn't matter which of the two points on a line you choose to call (x1, y1) and which you choose to call (x2, y2) to calculate the slope of the line.

a. true
b. false

ANSWER

A. True

EXPLANATION

Let



and



be two points on the straight line.

Then the slope is given by



This implies that,



Let us now choose it the other way round,




Then the slope is,



We still had they same result. Hence it doesn't matter which one you choose to call


and which to call