Posted by **John** on Wednesday, January 30, 2013 at 5:48pm.

I have a input output table and I can't figure out the rule here is the chart

X. Y

_______________

1. | 3

4. | 7

7. | 11

Can u figure it out I'm having a really hard time with this problem!!!!

- Math!!! -
**Reiny**, Wednesday, January 30, 2013 at 5:55pm
slope between (1,3) and (4,7) = 4/3

slope between (4,7) and (7,11) = 4/3

so it looks like the relation is linear

let the equation by y = (4/3)x + b

Plug in (1,3)

3 = (4/3) + b

b = 3-4/3 = 5/3

equation:

y = (4/3)x + 5/3

or

3y = 4x + 5 ----> 4x - 3y + 5 = 0

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