General point slope form is :
y – y1 = m (x – x1)
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