Virtually everywhere; in fact the entire notion of the derivative of a function is based on slope. Both slope and derivative have uses in real life, e.g. your position, speed and acceleration can be calculated using either. Or, you could find the derivative of a logistics curve (a curve that models population growth), etc.
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Do you mean how is slope used in real life? Well, to plan road building on mountains. Designing roofs so water runs off. Anything that you must plan to not be flat, but slant, has a slope. But, believe it or not, school is part of real life, so, even thouth you might pretend it is not, when you use it in math class that's pretty real.
Real-life examples of slope can be seen in various scenarios, such as driving on a hilly road where the slope indicates the steepness of the incline. In construction, the slope of a roof determines how water drains off the surface. In economics, the slope of a demand curve represents the rate at which quantity demanded changes with a change in price. These examples demonstrate how slope is a crucial concept in understanding and analyzing real-world phenomena across different disciplines.
The slope-intercept equation y = mx + b is that they mechanically substitute for m and b without understanding their meaning.
Real life is a real life example!
They are used to mount telescopes and binoculars.