f(x)=15x + 4
What is the question?
The given expression is a linear function of x, which can be written in the form f(x) = mx + b. In this case, m represents the slope of the line and b represents the y-intercept.
For the function f(x) = 15x + 4, the slope is 15 and the y-intercept is 4.
To evaluate the function for a specific value of x, you simply substitute that value into the function and simplify. For example, if you wanted to find f(3):
f(3) = 15(3) + 4
= 45 + 4
= 49
Therefore, when x = 3, f(x) = 49.
You can also graph the function by plotting the points and connecting them with a straight line. The y-intercept is the point (0, b), so the y-intercept of this function is (0, 4). From there, you can use the slope (15) to find other points on the line. For example, if you move one unit to the right, you move 15 units up (slope-rise over run), so the next point would be (1, 19). By connecting the points, you can draw a straight line that represents the function.