Step-by-step explanation:
1.
(y -y1) = m(x -x1)
(6 -8) = m(1 -(-2))
-2 = 3m
m = -2/3
2.
slope = ∆y/∆x
slope = (8 -6)/(-2 -1)
slope = 2/-3
Now to find the full expression let's substitute the values of x and y using the slope:
6 = 1×2/-3 + b
6 = 2/-3 +b
b = 6 - 2/-3
b = 16/3
So the expression is:
y = 2x/-3 + 16/3
