Question

6) The three points (15, 189), (9, 111) and (-7, y) are all on the

Answer 1

Answer:

Step-by-step explanation:

If it's on the same line, that means that the slope from each point to the other must be the same.

Using the first given points, we can calculate the slope to be:

$m = \frac{189-111}{15-9}=\frac{78}{6}=13$

We can solve for y

$13 = \frac{111-y}{9--7}\\13=\frac{111-y}{16}\\111 - y = 208\\y = -97$

We can double check:

$m = \frac{111--97}{9--7}\\m=\frac{208}{16}=13$