# How do you make this equation x+4y=36 in the form y=mx+b?

Isolate $y$ on the left taking $x$ to the right (changing sign) and divide the right side by $4$:
$4 y = - x + 36$
$y = - \frac{x}{4} + \frac{36}{4}$
$y = - \frac{x}{4} + 9$