Question 43720
Solve just like you would do with a normal linear equation with one variable, i.e., isolating y on one side of the equation.

{{{4x - 6y = -30}}}
{{{-6y = -30 - 4x}}}
{{{6y = 30 + 4x}}}
{{{y = 30/6 + 4x/6}}}
{{{y = 5 + 4x/6}}}

Therefore, we could define f(x) as 5 + 4x/6.