Question

A line with a slope of `-2` has coordinates `(2,7)` and `(5,y)`. What is `y`?

Answer 1

`y = 1`

Explanation:

slope `m` for a line passing through points `(x_1, y_1), (x_2, y_2) = (y_1 - y_2)/(x_1 - x_2)`

`-2 = (7-y)/(2-5)`

`-2 = (7-y)/-3` =>

`-2 *(-3) = 7 - y`

`7 - y = 6` => `y = 7-6` => `y = 1`