Question

x 2 4 6
y 1 0 –1

Explain how to write a function rule from the table below. Then write a function rule.

Answer 1

Figure it out! Sometimes, you just have to explore a little.

f(2) = 1 <== Start here.
f(4) = 0 <== Looks like x went up 2 and y went down 1. Let's see if this continues.
f(6) = -1 <== Looks like x went up 2 and y went down 1. What a lovely coincidence.

y moves half as much as x and in the opposite direction. What do you think?