Answer:
The correct answer is f(x)= 3x
Explanation:
If you look at the graph, you can take the slope intercept formula by using two points.
Two points on the graph include, (0,0) and (2,6)
Set it up like


slope would be 3x
Equation would be f(x)=3x
--------
Another way to solve this is by plugging in the coordinates of one of the points on the graph to the equations listed. Which ever one prove true would be the correct slope and equation.
--
The fastest way to solve this problem is using the rise over run method.
From the origin point, you move up how many units to the next point? 6. and from the origin point, you move right how many units to the next point? 2. 6/2 = 3 and correct slope is 3x. Equation f(x)=3x