First, you solve for y in terms of x.

2x + 3y = 4

3y = 4 - 2x

y = 4/3 - (2/3)x

Now, replace "y" with "F(x)"

F(x) = 4/3 - (2/3)x

2x + 3y = 4

3y = 4 - 2x

y = 4/3 - (2/3)x

Now, replace "y" with "F(x)"

F(x) = 4/3 - (2/3)x