Hi Mp5xm8

Is this what you mean?

y = - 1/2 ------------------> already in standard form where A = 0, B = 1, C = -1/2

y = (13/10)x

(13/10) x - y = 0 --------> A = (13/10), B = -1, C = 0

or

y = (13/10) x

10 y = 13 x

13 x - 10 y = 0 ----------> A = 13, B = -10, C = 0