ANSWER
The equation is
[tex]y - 5x + 20 = 0[/tex]
EXPLANATION
Let the equation be
[tex]y = mx + c[/tex]
where
[tex]m = 5[/tex]
is the slope of the line.
We substitute this value to obtain,
[tex]y = 5x + c[/tex]
Since the line passes through
[tex](4,0)[/tex]
we can use this point to determine the value of c.
We substitute this point to obtain,
[tex]0 = 5(4) + c[/tex]
[tex]0 = 20 + c[/tex]
[tex]c = - 20[/tex]
Our equation now becomes
[tex]y = 5x - 20[/tex]
We can write this in standard form as
[tex]y - 5x + 20 = 0[/tex]