# Math Help - Slope Intercept Form

1. ## Slope Intercept Form

I had a bad pre-algebra teacher in 7th grade, and she just talked on while making us write down notes that we wouldn't remember while trying to listen to her, and I didn't understand it when I looked at the section on NCVPS, or when my Algebra 1 teacher went over it in class.

f(x) = -2x + 5, and g(x) = x^2 - 4x + 1. Find the given Values.

1. f(1/2)
2. g(-2)

2. Originally Posted by Epidemic Proportions
I had a bad pre-algebra teacher in 7th grade, and she just talked on while making us write down notes that we wouldn't remember while trying to listen to her, and I didn't understand it when I looked at the section on NCVPS, or when my Algebra 1 teacher went over it in class.

f(x) = -2x + 5, and g(x) = x^2 - 4x + 1. Find the given Values.

1. f(1/2)
2. g(-2)

What does this have to do with "slope-intercept form???"

I'll do the first, you do the second.

You've got $f \left ( \frac{1}{2} \right )$. What this means is, wherever we see an "x" in the definition of the function you put a 1/2, so
$f \left ( \frac{1}{2} \right ) = -2 \left ( \frac{1}{2} \right ) + 5 = -1 + 5 = 4$.

-Dan

3. g(x) = x^2 - 4x + 1

So if g(2) = 4 - 8 + 1 = - 3?

Also, Sorry if it didnt have to do much with slope intercept, but didn't understand what I was doing at all, even if it was easier than it looked. It did have to do with Linear equations right?

4. Originally Posted by Epidemic Proportions
g(x) = x^2 - 4x + 1

So if g(2) = 4 - 8 + 1 = - 3?

Also, Sorry if it didnt have to do much with slope intercept, but didn't understand what I was doing at all, even if it was easier than it looked. It did have to do with Linear equations right?
You got it right!

It had more to do with linear functions, not equations. But there's no need to worry over the label too much, either.

-Dan

5. Originally Posted by Epidemic Proportions
I had a bad pre-algebra teacher in 7th grade, and she just talked on while making us write down notes that we wouldn't remember while trying to listen to her, and I didn't understand it when I looked at the section on NCVPS, or when my Algebra 1 teacher went over it in class.

f(x) = -2x + 5, and g(x) = x^2 - 4x + 1. Find the given Values.

1. f(1/2)
2. g(-2)

Originally Posted by topsquark
What does this have to do with "slope-intercept form???"

[snip]
-Dan
Aww come on topsquark - give the guy a break. S/he "had a bad pre-algebra teacher in 7th grade" .....