</span>y –<span> y</span>1<span> = m </span>(<span>x </span>–<span> x</span>1)
Given : X1 = 4 Y1 = 1 m = - 5
Substituting the values into the main equation: We get: y-1 = -5 (x - 4) This is the point slope form.We can simpify further to get the slope intercept form. Thus, y -1 = -5x + 20 y = -5x + 20 + 1 y = -5x + 21