Question

–3x+4

Answer 1

This is an expression. Do you have a question relating to this expression?

Answer 2

Graph y=–3x+4 .

Answer 3

Do you know that slope intercept form is?

Answer 4

Not really

Answer 5

It looks like this:
\[y = mx + b\]
Where m is the slope and b is the y intercept

Answer 6

So if the slope is 1, then the rise is 1 and the run is 1, and if the intercept is 5, then the line would intersect the y axis at 5.

Answer 7

Because 1 = 1/1

Answer 8

Youre better than my math teacher

Answer 9

If the slope were 2, the rise would be 2 and the run would be 1, since 2 = 2/1.

A negative example:

-1
The slope would rise (go down) by 1, then run by 1.

Answer 10

Since -1 = -1/1

Answer 11

But the slope is 3 right?

Answer 12

Negative three

Answer 13

So what would be the y?

Answer 14

the y intercept?

Answer 15

Yeah

Answer 16

y = mx + b
b is the y intercept

Answer 17

So what is the y intercept for this line?

Answer 18

4?

Answer 19

Correct

Answer 20

So where would your line intersect the y axis at?

Answer 21

By the way, intersect means to cross. And the y axis is the vertical one (up and down), x axis is left to right (horizontal).

Answer 22

Okay so it would be (-3,4)?

Answer 23

What is that coordinate supposed to be?

Answer 24

What do you mean?

Answer 25

-3 is the x and 4 is the y

Answer 26

Let me give you an example.
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This is the line y = -2x + 2

Answer 27

Because the y intercept is 2, so it intercepts the y axis at 2, then it rises (goes down, since it is negative) by 2 then runs by 1, since -2 = -2/1

Slope is rise/run

Answer 28

Okay so the rise is 3 correct?

Answer 29

What sign does the 3 have?

Answer 30

Sorry -3

Answer 31

So what would be the rise, would it go up or down

Answer 32

Down because it is negative

Answer 33

By how many units does it go down?

Answer 34

3

Answer 35

Then how many units does it run by?

Answer 36

4?

Answer 37

Remember the slope is rise over run. What is another way to write -3?

Answer 38

I gave examples of it above.

Answer 39

3//1?

Answer 40

Correct, but remember the negative sign. So what would be the run?

Answer 41

-3/1

Answer 42

Slope is rise/run, so what would be the run?

Answer 43

4?

Answer 44

I'm confused a balls

Answer 45

If the rise is -3, then what must the run be?

Answer 46

Look at what you just wrote

Answer 47

-3/1

Answer 48

Okay

Answer 49

\[Slope = m = \frac{ Rise }{ Run } = -3 = \frac{ -3 }{ 1 }\]

Answer 50

Maybe that will help give you some perspective.

Answer 51

I'm stupid the run would be 1 correct?

Answer 52

Correct

Answer 53

And the y intercept is 4, so that is where you would start drawing the line.

Answer 54

Rise is 3 run is 1

Answer 55

Yes, just remember the negative sign

Answer 56

Socorro would be(-3,1) and (4,1)?

Answer 57

You would be surprised how often this can impact your calculations in many other levels of math. Best to make a practice of it here in algebra.

Answer 58

Okay thank you good sir

Answer 59

How did you get those points?

Answer 60

*coordinates

Answer 61

So justx(-3,1)

Answer 62

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That is where your (-3,1) and (4,1) are. If you were to draw a line through those points, the slope would be 0 since it is not rising.

Answer 63

I think I got it now

Answer 64

(-3,1) and (4,0) right?

Answer 65

hmm

Answer 66

It sounds like you are guessing, since you haven't explained how you are getting these numbers.

Answer 67

I'm kind of guessing but I'm also trying to do it correct

Answer 68

Let me show you a step by step of how you would graph something simple.

Answer 69

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Answer 70

Brb

Answer 71

Back

Answer 72

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Answer 73

Let me know if you can see those screenshots

Answer 74

yeah i can see them

Answer 75

Okay thank you

Answer 76

Once you have two points, you can draw a line. The y intercept is always the first point, and easy one. In this example it is at (0,1). Then we draw the second point from the slope, which is a rise of 2 up and a run of 1 to the right. We get our second point at (1,3)