Question

If point (4,5) is on the graph of a function, which equation must be true?O f5=4O f5,4)=9O f14)=5O f5,4)=1

Answer 1

we know the independent variable is x, so the function will be f(x)

to find this we need to clear variable Y, so:

$\begin{gathered} 9x+3y=12 \\ 3y=12-9x \\ y=\frac{12}{3}-\frac{9}{3}x \\ y=4-3x \end{gathered}$

So the answer is:

$f(x)=4-3x$