Final answer:
The slope-intercept form (option D) is used to find the linear function of f(x). It provides a clear representation of the slope and y-intercept on a graph.
Step-by-step explanation:
The linear function of f(x) can be found using the slope-intercept form, which is represented by option D. The slope-intercept form of a linear equation is y = mx + b, where m is the slope and b is the y-intercept. By identifying the values of m and b, you can determine the equation of the linear function.
For example, if you have a linear function where the slope is 2 and the y-intercept is 3, the equation would be y = 2x + 3.
The slope-intercept form is commonly used to find the equation of a linear function because it provides a clear representation of the slope and y-intercept on a graph.