Answer:
3 dots
Step-by-step explanation:
This should be correct due to there only being 3 100% on the table
Given:
A line contains the points R(-1, 8), S(1, 4) and T(6, y).
To find:
The value of y.
Solution:
Three points are collinear if:

A line contains the points R(-1, 8), S(1, 4) and T(6, y). It means, these points are collinear.



Subtract 12 from both sides.

Divide both sides by 2.


Therefore, the value of y is -6.
3 - (7a + 1) =
3 - 7a - 1 =
-7a + 2 <===