This kind of equation consists of a problem in which you have the variables inside the number graphing line. Ex (1x,1y) In other words you have the point and the slope (which as you may remember from last class equals m.) Because each of these standered slope intercept forms have some sort of formula so does this one. This ones unlike the others like i said is placed as the numbers would be when wanting to graph when given the problem, but The formula however looks like this:
y-y1=m(x-x1)
The point of this form is to find lines with slopes that go through points (look at the picture below)
