Question

solve using elimination:
4p+5q=7
3p-2p=34
im really confused with this stuff...

Answer 1

i know how to do it, its just that i keep coming up with the wrong answers

Answer 2

Is the second equation correct or did you mistake a p for a q?

Answer 3

oh srry...the last equation is 3p-2q=34

Answer 4

q = (7-4p)/5
q = (34-3p)/-2

q = q

5(34-3p) = -2(7-4p)

170 - 15p = -14 + 8p

184 = 23p

p = 184/23

Good luck finding q

Answer 5

i said elimintation

Answer 6

That is elimination. I eliminated q from the equation and solved for p

Answer 7

but u solved for q first.. i was taugtht to just multiply each side...

Answer 8

I don't want to argue about it either

Answer 9

Is it a crime to solve for q first? Nope

Answer 10

srry didnt mean to offend u, im jus sooo confused i really hate these problems

Answer 11

gimme a sex goodman.. I have to relearn how to do it real quick

Answer 12

sec**

Answer 13

Okay, I'll finish solving for q. Dragon fly might take forever

Answer 14

okay, so an easier way is to jus solve for q?

Answer 15

I can solve with subsitution.. I'm not great with elimination.

Answer 16

same..erybody says elimination is the easiest but i dunt think so...i keep trying and end up with decimals when the answers are whole numbers....

Answer 17

q = 115/23

Answer 18

There's no easy way to solve for q

Answer 19

the answer is 8,-5 according to the back of my textbook....

Answer 20

I'm getting fractions/decimals..

Answer 21

i swear i didnt..all ma answers come out as decimals too...and the answers come out to be hole nums too...

Answer 22

I'll figure it out

Answer 23

well I got q = 41/7

Answer 24

thnxs now i dunt feel so stupid anymore for getiing the wrong answr cuz u too got wrong answrs...

Answer 25

The back of the book could be wrong... Not sure it's been years since I did this.

Answer 26

not all the problems could be wrong thou...

Answer 27

Not all of them. Just that one. It's possible.. I'm trying

Answer 28

well im getting all them as decimals or fractions...

Answer 29

oh well ima try to do the rest of them...

Answer 30

thnks for the help...

Answer 31

Yeah, guess what? 184/23 = 8
and 115/23 = 5

Answer 32

well it says her that its gotta be -5

Answer 33

It is. I'm just showing you my calculations weren't that far off. You should be happy

Answer 34

ezactly y i gave u all a medal...

Answer 35

Actually I had -115/23, but when I put it into my calculator, I never use negative and I got excited, but as you can see I did get it. I just usually keep a fraction answer as a fraction.

Answer 36

Dragonfly gives up too easily

Answer 37

I haven't given up. Well I just did. But still I was trying to do it..

Answer 38

I'm sure you saw the above. I had it the whole time, I just normally keep the answer in fraction form if a get a fraction. I had no idea that those fractions divided evenly into whole numbers

Answer 39

i jus did it and i got the correct answer!!! im soo happy for ma self!!LOL

Answer 40

after like a gaziillilon times thou...

Answer 41

What method did you use?

Answer 42

I only did it once. Everything I did after that was merely checking. I knew I had it

Answer 43

elimintation..jus as i was asked to do...i jus multiplied the first equation by 2 and the second eq. by 5 and i got the answer!!!!

Answer 44

Trust me....I did the exact same thing you did. You just don't understand my way yet. I bet your answer came out to a fraction like mine where you had to divide the fraction to get 8 and -5, correct?

Answer 45

yes! I FEEL SOO SMART LOL!!

Answer 46

Good for you

Answer 47

now to do the other 50 problems like this...ughhhhh

Answer 48

If they're exactly like that and you really do have fifty more, I feel sorry for you.

Answer 49

yea wat ever...ma dumb teacher didnt even give us notes, jus said to read the example of them and stacks hmmk over us...

Answer 50

Honestly, the reason I ended up doing these the way that I do it is because it is one way that works everytime. I don't have to try to decide whether I want to use substitution or elimination or addition/subtraction method.

I have one method that I use the exact same way everytime and I get the right answer every time.

Answer 51

trying to use all those different methods get too confusing

Answer 52

Oh whatever. I was doing that too and it didn't turn out lol

Answer 53

true..but i keep thinking wat if on an exam we were to do it a certain method and i didnt know how to do it? thats why i take the time to know them so i wont mess up.....

Answer 54

I'm not even in school. I'm sitting here doing math for fun.

Answer 55

If you have to solve by elimination or substitution, you could argue that my way is actually a combination of both.

Answer 56

Dragonfly, I'm no different from you.

Answer 57

It's been a while.. I just like doing it. I find it cool how I have a terrible memory but I can remember what I did in Algebra in hs.

Answer 58

ughh u guys are soooo lucky, i got tons of hmmwk as a 9th grader in alg 2..IM SOO HAPPY I FOUND THIS SITE!!!

Answer 59

One thing you'll notice about me is I don't use any of the traditional methods of Algebra to solve algebra problems...Never did.....(although I understand them) but I don't agree with them.

I DON'T use FOIL, I don't use the QUAD FORM, I don't use SUB or Elimination methods

Answer 60

It's alright. I help my sister with Algebra 2 almost daily. I use all of the traditional methods.. lol

Answer 61

WOW.. im a dumb nut..i gotta do it old fashion style...:(

Answer 62

None of those " traditional methods" are systematic.

In fact, they're the reason why students become confused with Algebra

Answer 63

woah..u should be a math prof. u might actually help a lot of ppl

Answer 64

FOIL is more of an acronym than a truly algebraic method

Answer 65

ughh i hate foil....

Answer 66

Do you want to learn the other way to do it?

Answer 67

how...

Answer 68

FOIL means First Outer Inner Last

Answer 69

Okay, suppose you had to multiply (2x+4)(3x+5) what would you do if you couldn't use FOIL?

Answer 70

ya i noe i hate it i get lost in ma own math..

Answer 71

dragonfly, I know what FOIL means

Answer 72

hmm. our teacher told us that in that case we had to have everyitng memorized..

Answer 73

That wasn't to you bright one.

Answer 74

Dragonfly he knows what FOIL is too. He said he doesn't like it

Answer 75

He said HOW. As in How is FOIL more of an acronym than algebraic method.

Answer 76

I was going to elaborate on my posting but you both had moved on to another subject.

Answer 77

Anyways, to multiply (2x+4)(3x+5) without FOIL , do this: