Question

can someone explain linear equasions to me? pleaseeeeeeee!!!

Answer 1

Sure, is this linear algebra?

Answer 2

correct

Answer 3

Are you talking about equations such as y=mx+b?

Answer 4

no like slope and stuff

Answer 5

I'm confused, is this after Calc 3 and Diff EQ? or is this just basic algebra?

Answer 6

Such as orthogonal projections, contractions and dialiations, rotations, etc?

Answer 7

ill give you a problem example lol hang on

Answer 8

My question is, is this for Algebra I, II, etc. Or linear algebra?

Answer 9

algibra 1

Answer 10

Oh, Wow. Sure then.

Answer 11

Do you have a specific problem that you might need help with. I could use that as an example.

Answer 12

umm i could find one hang on plz

Answer 13

k

Answer 14

what is the equasion of a line in general form that passes through (-1,2) (5,2)

Answer 15

For this question, use the slope formula to find the slope.
So for this question, you have 2 points::(-1,2) (5,2)

So, slope = y2-y1 all over x2-x1

so, (2-2)/(5-(-1)). this would give you the slope.

Answer 16

The slope would be: 0

Answer 17

This is because this is a horizontal line.

Answer 18

so an equation for this question would be y=2

Answer 19

but the options are x-2=0, y-2+0, or y-x-2=0

Answer 20

y-2+0, is the same as y=2

Answer 21

It would be y-2+0.

Answer 22

oh

Answer 23

what about if it was... (1,-2) and a slope of 1/3?

Answer 24

Use the point slope formula. (y-(-2)=(1/3)(x-1).

Answer 25

y=(1/3)x-(7/3)

Answer 26

i still sont understand

Answer 27

What exactly do you not understand?

Answer 28

how the whole process works i cant figure it out

Answer 29

ok, So in algebra I, You have to memorize 3 formulas.

Answer 30

okay..

Answer 31

They are

Slope intercept formula: y=mx+b

Point slope formula: (y-y1)=x(x-x1),

and general formula:

ax+by=c

Answer 32

Now, say you are give a y-ntercept and the slope of a line, you would want to use the slope intercept formula. This is because the (m) is where you plug in the slope and (b) is where you plug in the y-intercept.

Answer 33

With these 3 formula's you can pretty much solve any Algebra I graphing question.

Answer 34

It might be kinda hard to interpret everything that i'm saying, so just ask if you get confused.

Answer 35

CONFUSED!!

Answer 36

Okay, then let me start with even more basics. In Algebra you are introduced to solving very simple equations.

For example, 3x=9. You are asked to solve for x.

You are then later introduced something new. Graphing.

Answer 37

Does this look familiar?

Answer 38

X=3

Answer 39

Correct, this is just the very basics of Algebra.

Answer 40

okay, i got that

Answer 41

Graphing is then introduced to help you solve an equation that has 2 variables. A variable can be (x, y, z, ) etc.

Answer 42

yup

Answer 43

For example, you are then given 3x+2y=1. This is kinda hard to just solve. When you graph it, it makes finding what x and y easier.

Answer 44

That's pretty much the whole purpose of graphing.

Answer 45

okay, to make things easier?

Answer 46

Then, you are later introduced more complex concepts such as slopes, y intercepts, x intercepts, and coordinate points.

Answer 47

This all refers to graphs.

Answer 48

okay can we do a problem on this

Answer 49

Sure

Answer 50

Do you have one in mind?

Answer 51

nooo not really

Answer 52

okay. Say you have a question that asks you to find the slope of 2 coordinate points. For example, the point (2,4) and (5,6). You can chose any points, it doesn't really matter.

Answer 53

To find the slope between any 2 points, you use a formula that has been made for you.

Answer 54

Let me graph this points. It might make explaining easier.

Answer 55

wich us?

Answer 56

okay you csan do that if you want

Answer 57

Look at the attachment.

Answer 58

i remember that

Answer 59

Good. Do you know what y and y1 and x and x1 mean in that equation?

Answer 60

the coordinates 2,4 and 5,6..i think x1=2, y1=4, x2=5, y2=6? right?

Answer 61

yes

Answer 62

then you flip then like on the equasion

Answer 63

What do you mean flip?

Answer 64

So, using that equation that i posted above, can you fine the slope?

Answer 65

like y2-y1 (2-4) right?

Answer 66

-2, 3?

Answer 67

-2/3?

Answer 68

Thats close. But not correct.

Answer 69

oh... then what?

Answer 70

What is 6-4? and 5-2?

Answer 71

2,3?

Answer 72

so 2/3?

Answer 73

yes.

Answer 74

sweet, so whats next

Answer 75

Okay, so find the slope between (-2,3) and (5,-8)

Answer 76

Let me know what you get.

Answer 77

3/5?

Answer 78

no.

Answer 79

hang on

Answer 80

Its a littler trickier when you get involved with negative numbers.

Answer 81

i've gotten , -7/11?