Answer:
D) [tex]f(x)=1.5x[/tex]
Step-by-step explanation:
Direct variation is the opposite of Proportional Variation. It is given according to this formula:
[tex]y=kx[/tex]
The notation f(x) = y. Since f(x)=y= 6 and x=4 Firstly let's find k. Then plug it back to the original one.
We have:
[tex]y=kx\\6=k4\\k=\frac{6}{4} =k=\frac{3}{2}\\y=\frac{3}{2}x \Rightarrow y\approx1.5x[/tex]
