Question

Can someone help me with Algebra 2?

Answer 1

Sure. Just post the problems that you need help with.

Answer 2

Number 18

Answer 3

So you need to write an equation for the line shown in the graph. Are you familiar with slope intercept form (shown below) ?

y = mx + b

Answer 4

Yes

Answer 5

What does m and b stand for?

Answer 6

M is slope and B is the y intercept

Answer 7

What is the y intercept?

Answer 8

On the problem?

Answer 9

In general, like what is it?

Answer 10

The point where the line crosses the y axis

Answer 11

Correct. So simply locate that point on the graph and you have your b value.

Answer 12

I just wanted to make sure you knew what it was.

Answer 13

So would it be -2?

Answer 14

Correct.

Answer 15

What about m?

Answer 16

m stands for the slope of the line. Do you know what slope is?

Answer 17

The measure of of a line?

Answer 18

Close. It is the rise/run of a line. Let me give you an example. Say I have some stairs.



Each step is three inches long and one inch high. If I were to put a straight line over the top of each step, the slope of it would be 1/3. That's because it rose by one and ran by three.

Answer 19

Note that rise relates to the y axis (vertical) and run relates to the x axis (horizontal). Try to get the imagery in your mind of it rising, then running. That helps you envision the slope well.

Answer 20

So is rise over run? so for a examply 5 would be rise and 2 would be run?

Answer 21

For problem 18?

Answer 22

No just a example. But for 18 would it be m=-2/-5x - 2?

Answer 23

Your rise is correct but your run is not. Try take a look at which direction it's going in.

Answer 24

Also, if a slope looks like this,


Then it is a negative slope. You obtain your slope by dividing two numbers, the rise and the run. If a slope is negative, then only one number (the rise or run) can be negative.

Answer 25

So 5?

Answer 26

Yes. It is moving towards the positive side of the x axis so the five would be positive.

Answer 27

m=-2/5?

Answer 28

Yes.

Answer 29

So y=-2/5 - 2?

Answer 30

Wait I think I'm blind. Lol.

http://prntscr.com/klg3p9

Look at these two points. How much is the rise and how much is the run.

It's not -2/5. I don't know what points we were looking at, haha.

Answer 31

:/ this is confusing

Answer 32

http://prntscr.com/klg47m

This may help. How much did it rise by, and how much did it run by? It may also help to think of it as a triangle.

Answer 33

I cant see it

Answer 34

Look at your graph. Just find two points on the line, then measure by how much it rose, then by how much it ran.

Answer 35

Can you view that?

Answer 36

So it rose one and ran 3?

Answer 37

If it rose by one, it would be on the positive side of the x axis (above it). Instead, where did it go?

Answer 38

It went negative

Answer 39

So what sign would the one have?

Answer 40

-1/3?

Answer 41

Correct

Answer 42

So it would be y=-1/3x - 2?

Answer 43

Yes

Answer 44

Ok thank you!

Answer 45

No problem. Glad you got it.