Question

How do you write the equation in point slope form given (4,1) , m=undefined?

Answer 1

`y-1=(4-c)/(1-d)(x-4)`

Explanation:

make another point `(c,d)`
and the slope can be written as
`m=(4-c)/(1-d)`
so
`y-1=(4-c)/(1-d)(x-4)`