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Pre- calculus Slope The slope m of the line through the points (x1, y1) and (x 2, y 2) is given by Point slope :The straight-line equations is called the "point-slope" y – y1 = m(x – x1) The following formulas well help you solve for the shifts, reflection, transformation, vertical shift and all that good stuff. Example from purple math For F(t) = Af(Bt – C)+D, where f(t) is one of the basic trig functions, we have: A: amplitude is A B: period is (2π)/|B| C: phase shift is C/B D: vertical shift is D