$It doesn't matter, the form is,$
y = mx + b
x = \frac{y}{m} - b
x = \frac{y}{m} + a, \;$where$\; a=-b,\; a\;$and$\; b \;$are real numbers.$
$The answer to your question, it is conventional to write a linear equation is general form:$\; ax+by+c=0, \;$or for a equation of a straight line...