Or just feel free to tell me how to do them, by using an example as well pleas!

If g (3) = 12, then g (x) = 2x +

If f (-3) = - 8, then f (x) = 3x +

If f (x) = 25 - 2x, then f (5) =

If f (3) = 20, then f (x) = 5x +

If g (4) = 16, g (5) = 18, g (6) = 20, then g (3) =

If f (2) = 20, f (3) = 25, f (4) = 30, f (5) = 35, then f (7) =

f (7) = 18, then f (x) = 2x +

If f (x) = 3x - 12, then f (4) =

If g (t) = 4 - 3t, then g (-2) =

1. g (x) = 2x+6

2. f (x) = 3x+1

basically f (x) means that x is any number. So f (3) means that that number is 3. Now when you do f (x) = 2x that's just saying f (3) = 2 (3), or 2*3=6. Everytime you evaluate f (x) for any number of x, you take every x on the right side of the equation and input it with that number. 2x does not become 23, but 2*x.

Now you know that f (-3) = - 8 and the equation has f (x) = 3x. Now every linear function has a constant. Sometimes that constant is zero which gives the appearance there is no constant. Now your job is to figure out what the constant is. So f (-3) and f (x) = 3x means that f (-3) = 3 * (-3) + constant. Now 3*-3=-9, and we know f (-3) = - 8, so that means your function is 3x+1.