Tables
Writing a Function Rule
Example
Write the function rule for the line that models {(1, 3), (2, 4), (3, 5), (4, 6)}
Step 1. Choose any two points to find slope.
Step 2. If the y-intercept is available, substitute in (0,b) for b.
Not available in this example
Step 3. Since the y-intercept was not given, select any point and substitute in the x and y values in to y = mx + b to solve for b.
Using the point (1, 3)
Step 4. Substitute the values for m and b into y = mx + b to create the function rule.
