Question

The points (n, -1) and (10, -3) fall on a line with a slope of -
What is the value of n?

Answer 1

slope = (y2-y1)/(x2-x1)

$\frac{ - 1}{7} = \frac{n - 10}{ - 1 - - 3} = \frac{n - 10}{2}$

$\frac{ - 2}{7} = n - 10$

$- 2 = 7n - 70 \\ 7n = 68 \\ n = 9.7$