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:
[tex]m = \frac{189-111}{15-9}=\frac{78}{6}=13\\[/tex]
We can solve for y
[tex]13 = \frac{111-y}{9--7}\\13=\frac{111-y}{16}\\111 - y = 208\\y = -97\\[/tex]
We can double check:
[tex]m = \frac{111--97}{9--7}\\m=\frac{208}{16}=13[/tex]
