# Hello! I need help from someone to know where is my mistake. I have those coordonate table and if they are linear, I have to find the formula. I'm good with this exercice BUT the 2 red ones are...

Hello!

I need help from someone to know where is my mistake.

I have those coordonate table and if they are linear, I have to find the formula.

I'm good with this exercice BUT the 2 red ones are ALWAYS the one that are wrong... i dont know what to do.

Also, I saw that the first letter is different: CAP and doenst look like f(g) or f(x).

So... my guess is the formula will be different... I dont have a clue... thank you!

**Images:**

### 2 Answers | Add Yours

In case **b)** you've written `R=3.5x+0.0` but `R` is not function of `x` but of `q.` In other words your variable is no longer called `x` but it's called `q` instead. So you should have written `3.5q+0.0.`

The same goes for case **f) **where your variable is `p` instead of `x` and result should be `0.05p+0.00.`

So to summarise the only problem was the names of the variables which may seam trivial to you but is very important once you get to multivariable functions.

oh no! and I'm wearing glasses...

thank you!