m=2 (4,-3)

There are a number of ways to do this, but since the problem gives you a point and the slope, why not first write the equation in point-slope form? Then, all you have to do is some trivial algebra to solve the equation for y, and then it will automatically be of the form y=mx+b (i.e. slope-intercept form).

Remember that point-slope form is

(y-y_0) = m(x-x_0)

where x_0 and y_0 are the x- and y-coordinates of any point on the line.

Can you take it from there?