Question

Write a rule for the linear function in the table.

x
1
2
3
4

f(x)
3
2
1
0



f(x) = x + 4


f(x) = 4x


f(x) = x – 4


f(x) = 4 – x

Answer 1

f(x) = 4 - x

Explanation:

'f(x) = blah-blah' is the same as saying 'y = blah-blah', except it is also telling you that the x-y relationship is a function.

I notice that for each case, x + y = 4, so y = 4 - x

Or in 'function' terminology, f(x) = 4 - x