what is the function rule for (1,2), (2,16), (3,54), (4,128), (5,250)?

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lfryerda's profile pic

lfryerda | High School Teacher | (Level 2) Educator

Posted on

To find the function rule, it is important to find any invariant values for each x-value.  In this case, we see that if we cube each x-value and then multiply by 2, we get the corresponding y-value.  That is:

`2times (1)^3=2`

`2 times(2)^3=2(8)=16`




This means the function rule is `y=2x^3` .

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button33 | Student, Grade 11 | (Level 1) eNoter

Posted on

This is a power regression, with the equation y=2x^3.


You can plot this on a graphing calculator to solve, which is the easiest solution. However, to do it with algebra, you need to have a mental picture of what the graph looks like to determine what type of equation to use. Afterwards, plug in numbers to try to make a fit.

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