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2. Linear function (calculus) - Wikipedia

   en.wikipedia.org/wiki/Linear_function_(calculus)

   The y-intercept point (,) = (,) corresponds to buying only 4 kg of sausage; while the x-intercept point (,) = (,) corresponds to buying only 2 kg of salami. Note that the graph includes points with negative values of x or y , which have no meaning in terms of the original variables (unless we imagine selling meat to the butcher).

3. Slope - Wikipedia

   en.wikipedia.org/wiki/Slope

   Slope illustrated for y = (3/2)x − 1.Click on to enlarge Slope of a line in coordinates system, from f(x) = −12x + 2 to f(x) = 12x + 2. The slope of a line in the plane containing the x and y axes is generally represented by the letter m, [5] and is defined as the change in the y coordinate divided by the corresponding change in the x coordinate, between two distinct points on the line.

4. Progressive tax - Wikipedia

   en.wikipedia.org/wiki/Progressive_tax

   Geometrically, the line for tax on the top bracket intercepts the y-axis at −$3,000 – it passes through the point (, $,) – and has a slope of 0.3 (30%). In the United States, the first form was used through 2003, for example (for the 2003 15% Single bracket): [ 61 ]

5. Linear equation - Wikipedia

   en.wikipedia.org/wiki/Linear_equation

   A non-vertical line can be defined by its slope m, and its y-intercept y 0 (the y coordinate of its intersection with the y-axis). In this case, its linear equation can be written = +. If, moreover, the line is not horizontal, it can be defined by its slope and its x-intercept x 0. In this case, its equation can be written

6. Slope field - Wikipedia

   en.wikipedia.org/wiki/Slope_field

   the slope field is an array of slope marks in the phase space (in any number of dimensions depending on the number of relevant variables; for example, two in the case of a first-order linear ODE, as seen to the right). Each slope mark is centered at a point (,,, …,) and is parallel to the vector

7. Bresenham's line algorithm - Wikipedia

   en.wikipedia.org/wiki/Bresenham's_line_algorithm

   where is the slope and is the y-intercept. Because this is a function of only x {\displaystyle x} , it can't represent a vertical line. Therefore, it would be useful to make this equation written as a function of both x {\displaystyle x} and y {\displaystyle y} , to be able to draw lines at any angle.