finding linear equation, given inputs and outputs (2x+1)

[Bladesofhalo]

Given a set of fixed "inputs", i have to write the function that describes each output.

X Value
-3
-2
-1
0
1
2
3

Prob.2 F(X)
-5
-3
-1
1
3
5
7

Now the teacher gave us the anser of f(x)=2x+1, but how do you work this problem out to get that.

 

[Denis]

Re: More linear questions

Make up your mind, Blade :!:
x = -3
2x + 1 = 2(-3) + 1 = -6 + 1 = -5

Carry on...

 

[Bladesofhalo]

Yes, thats how you check your answer, but what if the 2x+1 wasnt there? How would you solve it, that was my main question. So then f(x) = what