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slope formula definition math. The slope of a line is the ratio of the amount that y increases as x increases some amount. Slope tells you how steep a line is or how much y increases as x increases.
The slope of a line is a number that measures its steepness usually denoted by the letter m. Keep these facts in mind. Slope is the rise over the run or the rate at which something is changing which is the same as saying the slope is the change or distance in y over the change in x.
The equation y 400 x 640 is in slope-intercept form because we can look at it and immediately see the slope and the y -intercept.
However in math slope is defined as you move from left to right. Slope is a ratio that includes how y changes for every unit increase of x. The line is less steep and so the Slope is smaller. We then write the slope as a fraction.