+1975 The way i learned it is to put all of this into a x and y chart, or in this case a x and f(x) chart. i'll just give you the set up for it incase you dont know it yet. also, in my class for linear lines we only put 3 numbers but you can do more in the x side
the f(x) side is where you put the answer for the equations
| x | f(x) | |
| -2 | f(-2) = 1/2(-2) + 1 | |
| 0 | f(0) = 1/2(-1) + 1 | |
| 2 | f(2) = 1/2(2) + 1 |
after you finish finding the answers, you can graph them by simply putting the x and f(x) numbers together in parantheses ( , ) for example x was 9 and the answer to the equation was 11 so you put them together like so: (9,11)
after that just see if (2,2) is on the line! i hope this helps
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Sort of an example above, but the answer to your question is below
This was an answer I did for someone who wanted help with points, and I hope that might help a little, because this was a question about functions (does the point (2,2) lie on the graph of f(x)=1/2x+1?) and first things first, do you know what a function is?
A function is a line that does not overlap at any point, if that makes sense. For example, if you get a set of points that is (1,2) (4,3) (8,2) that is not a function because there are two 2's for y's which means that they will be overlapping.
Some equations will tell you if an equation is a function by putting f(x)
I hope this helps a bit, just I'm not sure what you mean by "how do i do functions" which could be a few things :)
