# How do you graph 4x+5y-20=0?

You may start by recognizing that it is a linear function (between us...all the variables are on...a line...there are not $x$ in powers, in roots....in a fraction or in other functions).
You can chose 2 values of $x$ and evaluate the correspondent $y$. These will be the coordinates of the two points of your line (try to choose "easy" $x$!).
$x = 0 \to y = \frac{20}{5} = 4$
$x = 3 \to y = \frac{20 - 12}{5} = \frac{8}{5} = 1.6$