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Filename: controllers/calculator.php

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Given are two points on the straight line (3, 4) and (5, 10).

Slope of a line = change in Y axis values/ Change in X axis values.

This formula gives slope = (10 - 4) / (5 -3).

This equals slope = 6 / 2 = 3.

Given are two points on the straight line (6, 2) and (8, 14).

Slope of a line = change in Y axis values/ Change in X axis values.

This formula give slope = (14 - 2) / (8 -6).

This equals slope = 12 / 2 = 6.