Function Graphs and Their Shapes

Function graphs show how output values change when input values change. Each point on the graph is an ordered pair. The x-coordinate is the independent variable, and it sets the horizontal position. The y-coordinate is the dependent variable, and it sets the vertical position.

Linear functions su...

Consider a line that represents a linear function. Any point on the line has an x-coordinate for its horizontal position and a y-coordinate for its vertical position.

The horizontal coordinate x of a point is the independent variable. Substituting it into the function gives the vertical coordinate y, the dependent variable.