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how do i figure out x in a function?

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so I'm given the problem. if (x, 22) is a solution for the function (x) = 3x - 5, what is x?

okay so how do i do this. I'm completely lost. please help!

Dec 10th, 2014

so I'm given the problem. if (x, 22) is a solution for the function (x) = 3x - 5, what is x?


f(x) = 3x - 5

( x, y)

x is unknown here, but y is 22. y is the output of the function 3x - 5

so  y = 3x - 5

Since we know y = 22.

Substitute  to equation y = 3x - 5

                                    22 = 3x - 5

                                  22 + 5 = 3x 

                                    27 = 3x

                                     3x / 3 = 27/3

                                           x = 9

The solution is ( 9, 22) for the function y = 3x - 5.  

Dec 10th, 2014

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