Find the function rule

Question

x -2 -1 0 1 2
Y 9 4 -1 -6 -11

Answer 1

slope = (-6+1)/(1-0) = -5
so
y = -5 x + b
9 = 10 + b
b = -1
so
y = -5 x -1
or
5 x + y = -1