Question

How do you find an equation of the line having the given slope -9 and containing the given point (7,8)?

Answer 1

You can use 'point-slope form' of equation. I'm using that only. See below.

Explanation:

point slope form is `(y-y_1)/(x-x_1)=m` ( here m= slope, 1 is only the subscript.)

by using it,
`(y-8)/(x-7)=-9`

simplifying it

`y+9x=71`