This table shows input and output values for a linear function f(x).
What is the difference of outputs for any two inputs that are three values apart?
Express your answer as a decimal.
x f(x)
−3 −10.25
−2 −9.5
−1 −8.75
0 −8
1 −7.25
2 −6.5
3 −5.75
pleaseeeeeeee help