Question

Substitution Method
2x – y = -4
-3x + y = -9

Answer 1

is x=13 and y=30

Answer 2

i dont know i have to get answer show steps and check step

Answer 3

sorry yes that is right but i need how you got that and the check step

Answer 4

you need help?

Answer 5

the equation is already set up for you

Answer 6

in other words, you got your negative y and your positive y

Answer 7

so you just add the two equations together

Answer 8

it comes out to be -x=-13

Answer 9

which simplifies to x=13

Answer 10

to solve for y

Answer 11

you need to see whats a common multiple for 2 and 3

Answer 12

you also need one x to be positive while the other x is negative

Answer 13

a common multiple would be 6

Answer 14

so multiply 3 by 2 and 2 by 3

Answer 15

and you get 6x plus -6x

Answer 16

opps

Answer 17

actually multiply the first equation by -3

Answer 18

and the second equation by positive 2

Answer 19

nope

Answer 20

you know what you could do

Answer 21

use substitution

Answer 22

in other words, plug in x=13 into both equations

Answer 23

that will lead you to the conclusion that y=30

Answer 24

you need any more explanations?

Answer 25

I have taken Pre-Algebra, Algebra 1, and Algebra 2

Answer 26

Although I'm not an official helper member for this website

Answer 27

i dont get this stuff at all i can get the answers from a site but i cant explain how i got them no matter what i try to do thank you so muchi apprate it

Answer 28

do you understand now?

Answer 29

i got all kinds of problems with my math

Answer 30

or do I need to break it down into simpler terms?

Answer 31

someish

Answer 32

k

Answer 33

hmm...

Answer 34

2x – y = -4 -3x + y = -9

Answer 35

so

Answer 36

you want to find x or y first?

Answer 37

i dont know does it matter which one goes first just a question

Answer 38

nope

Answer 39

but y is easier

Answer 40

do you know why?

Answer 41

hint hint: +,-.

Answer 42

hint hint hint: canceling positives and negatives...

Answer 43

ohhh

Answer 44

HINT HINT: lolz, If I have three apples and I took three away, how much do I have left?

Answer 45

none

Answer 46

there we go

Answer 47

you understanding so far?

Answer 48

yea its a start lol

Answer 49

so all you have left is (2x=-4) +( -3x=-9)

Answer 50

do you know how to add positives and negatives?

Answer 51

its ok if you don't

Answer 52

my calulator?

Answer 53

besides the calculator... :D

Answer 54

like lets see I have two copies of Skyrim and someone takes three of them away, how many do I have left?

Answer 55

In other words, someone take two of the real Skyrim and took an imaginary one

Answer 56

So we have -1 Skyrims now

Answer 57

understand?

Answer 58

-1

Answer 59

k, so whats -x=-13?

Answer 60

a negative divided by a negative is...

Answer 61

sorry puter is being slow not ignoring you

Answer 62

its fine mon

Answer 63

what makes a person content:
A. Fifty piles of manure.
B. A bill of 50,000 dollars.
C. Cow manure.
D. 5 trillion dollars

Answer 64

this will lead you to the answer

Answer 65

but i dont kkn ow what x is to divide -13 by

Answer 66

What does this mean in mathematics, positive or negative?

Answer 67

k

Answer 68

a negative divided by a negative is always, always, ice cream cones always a positive

Answer 69

since -x and -13 are both negatives, a negative divided by a negative yields a...

Answer 70

I'll give you the first letter of the word

Answer 71

P

Answer 72

positive

Answer 73

CORRECT!!!!!!!!!!!!!

Answer 74

WE HAVE A WINNER!!!!!!!!!!!!!

Answer 75

so x=13

Answer 76

do you need further help to solve for y?

Answer 77

hint hint: plug in the value for x(hint hint hint: 2(13)=26 and -3(13) 39

Answer 78

I mean -39

Answer 79

i think i understand how do i check it

Answer 80

k

Answer 81

do you know how to solve 26-y=-4?

Answer 82

sorry i dont

Answer 83

its ok

Answer 84

so...

Answer 85

you subtract 26 by both sides

Answer 86

so you get -y=-30

Answer 87

this remind you of Pre-Algebra at all?

Answer 88

i have never done any algrbra class

Answer 89

then why are you doing algebraic formulas?

Answer 90

:D

Answer 91

and if you need help with basic algebraic formulas

Answer 92

http://www.khanacademy.org/

Answer 93

thats a very good website for learning the basics of Algebra

Answer 94

and if that bores you too much

Answer 95

just ask me for some Algebraic tips

Answer 96

k?

Answer 97

or ask people like eyust707

Answer 98

or dpalnc