Function tables and graphs

A function is a relation that assigns exactly one output for each input from a set of inputs.

This is the slope-intercept form of a linear equation, where m is the slope and b is the y-intercept.

Substitute the x-value into the function and see if the resulting y-value matches the y in the ordered pair.

The slope is -2.

The y-intercept is the point where the line crosses the y-axis, represented by the value of b in the equation y = mx + b.

Substitute the input value into the function's rule to calculate the output.

A function table is a table that displays pairs of input and output values for a function.

The ordered pair represents a specific input-output relationship defined by the function.

Plot the y-intercept on the graph, then use the slope to find another point, and draw a line through the points.

The output is -4.