If x represents any number in the first column witch expression can always be used to find the value of y in the second coloumn x 1 2 3 4

Y 5 7 9 11

Set up an equation and solve, or find a common sequence.

We can set up an equation like so, using x = 1 as a base:

x (number) + (another number) = y

translate to:

1 (x) + (number) = 5

The common difference is 2 for each y value, so let's use that as a multiplier:

1 (2) + number = y

2 + x = 5

x = 3

So lets move up a step:

x = 2 and y = 7

We use 2 as our multiplier and 3 as our adder:

2 (x) + 3 = y

2 (2) + 3 = 7

4 + 3 = 7

Lets try one more case:

x = 4 and y = 11

2 (4) + 3 = 11

8 + 3 = 11

11 = 11