Respuesta :
the equation of the line passing through the point (x1,y1) and having a slope of m is
y-y1=m(x-x1)
so
passing through (a,b) and having a slope of b is
x-b=b(x-a)
y-y1=m(x-x1)
so
passing through (a,b) and having a slope of b is
x-b=b(x-a)