This will need become a point slope form.
First we need to find slope
(Y2-Y1/X2-X1)
(8-5/4-0) = (3/4)
Slope = (3/4)
Now for the point slope equation
y - y1 = m(x-x1)
Plug in one of the points and the slope
y - (5) = 3/4(x - (0))
Let’s convert to y = mx + b formatting
y - (5) = 3/4(x - (0))
y - 5 = 3/4x - (3/4)(0)
y - 5 = 3/4x
y = 3/4x + 5
This will be your equation.