Phebe
  • Phebe
HELPZZ http://prntscr.com/7sq0eu
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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laughoutloud
  • laughoutloud
Do you know what two methods there are?
Phebe
  • Phebe
No well one is the matrix method i think
Phebe
  • Phebe
@Chumpian

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More answers

laughoutloud
  • laughoutloud
There is elimination and substitution
Phebe
  • Phebe
okay thanks
Phebe
  • Phebe
I just need to know how to do the problem
laughoutloud
  • laughoutloud
ok for A) 3x-9y=3 6x-3y=-24 Solve the first equation for x
Phebe
  • Phebe
ok so -9 on both sides?
laughoutloud
  • laughoutloud
add 9y on both sides
Phebe
  • Phebe
ok like this|dw:1436908249151:dw|
laughoutloud
  • laughoutloud
yes
Phebe
  • Phebe
so 3+9=12|dw:1436908316517:dw|
Phebe
  • Phebe
at the bottom those are 3's
laughoutloud
  • laughoutloud
ok so the first equation look like this. 3x=3+9y
Phebe
  • Phebe
Yes
laughoutloud
  • laughoutloud
great so divide 3 by both sides
Phebe
  • Phebe
ok hold on
Phebe
  • Phebe
|dw:1436908667158:dw|
laughoutloud
  • laughoutloud
k so when simplified we get x=1+3y
Phebe
  • Phebe
where you get that from?
laughoutloud
  • laughoutloud
|dw:1436908850564:dw|
Phebe
  • Phebe
okay i see
Phebe
  • Phebe
so what i do next
laughoutloud
  • laughoutloud
plug the equation into the second one like this 6(1+3y)-3y=-24
Phebe
  • Phebe
an then solve?
laughoutloud
  • laughoutloud
yes solve for y
Phebe
  • Phebe
ok
Phebe
  • Phebe
|dw:1436909266839:dw| which one i isolate?
laughoutloud
  • laughoutloud
ok so distribute out the 6
Phebe
  • Phebe
|dw:1436909395652:dw|
laughoutloud
  • laughoutloud
when you do that you get 6+18y-3y=-24
laughoutloud
  • laughoutloud
|dw:1436909525038:dw|
Phebe
  • Phebe
|dw:1436909655173:dw| right?
laughoutloud
  • laughoutloud
no subtract the 6
Phebe
  • Phebe
omg ok
Phebe
  • Phebe
|dw:1436909740180:dw|
laughoutloud
  • laughoutloud
|dw:1436909811890:dw|
Phebe
  • Phebe
OH that kinda looks easy so the first equation is -2 right?
laughoutloud
  • laughoutloud
no there's more lol y=-2 now plug in -2 for y in the first equation
Phebe
  • Phebe
ok lol T.T
Phebe
  • Phebe
Can you show me i dont know where to put it
laughoutloud
  • laughoutloud
|dw:1436910047668:dw|
Phebe
  • Phebe
so now i just put that the answer is -2 and -5?
laughoutloud
  • laughoutloud
yes but write it like this (-5,-2)
Phebe
  • Phebe
OKAY DANG THANK YOU! I BEEN WORKING ON THIS FOR 2 DAYS LOL
Phebe
  • Phebe
can you help me with part B?
laughoutloud
  • laughoutloud
sure
Phebe
  • Phebe
thanksz! do u still got the problem?
laughoutloud
  • laughoutloud
yes we are going to solve this one using elimination because it is quicker for this problem we solved the last one using substitution
Phebe
  • Phebe
did we use elimination for the last one i think it was substitution
laughoutloud
  • laughoutloud
no we used substituion
Phebe
  • Phebe
OK i knew it thanksz
laughoutloud
  • laughoutloud
we are going to solve this one together like this |dw:1436910768080:dw|
Phebe
  • Phebe
thats matrix right?
laughoutloud
  • laughoutloud
no the 3y cancels out
Phebe
  • Phebe
|dw:1436911023546:dw| and then we just move over the rest of the problem?
laughoutloud
  • laughoutloud
yes! add the two equations together like this |dw:1436911155428:dw|
Phebe
  • Phebe
and then we put x=3 in the problem?
laughoutloud
  • laughoutloud
yes plug it into either equation you can choose
Phebe
  • Phebe
ok let me see
Phebe
  • Phebe
|dw:1436911318766:dw|
laughoutloud
  • laughoutloud
ok |dw:1436911428534:dw|
laughoutloud
  • laughoutloud
so your answer for part b is |dw:1436911673328:dw|
Phebe
  • Phebe
OMG!!!!!!!! THANK YOU!
laughoutloud
  • laughoutloud
np do you want help with part c?
Phebe
  • Phebe
OH yea i almost forgot lol
laughoutloud
  • laughoutloud
lol We are going to solve this one using substitution
Phebe
  • Phebe
ok ima put that
laughoutloud
  • laughoutloud
I substituted y into the second equation |dw:1436911880872:dw|
Phebe
  • Phebe
|dw:1436912011827:dw|
laughoutloud
  • laughoutloud
not quite we have to distribute the 6 like this |dw:1436912140467:dw| I multiplied the six into the parenthesis
laughoutloud
  • laughoutloud
now we can add 36 to each side
Phebe
  • Phebe
|dw:1436912247899:dw| RIGHT
laughoutloud
  • laughoutloud
yes
laughoutloud
  • laughoutloud
so whats your new problem?
Phebe
  • Phebe
|dw:1436912323688:dw|
laughoutloud
  • laughoutloud
Correct |dw:1436912410251:dw|
laughoutloud
  • laughoutloud
now plug in the x value into the first equation
Phebe
  • Phebe
ok
Phebe
  • Phebe
|dw:1436912516544:dw|
laughoutloud
  • laughoutloud
|dw:1436912554603:dw|
Phebe
  • Phebe
so +6 on both ends right
laughoutloud
  • laughoutloud
actually we can just solve this by multiplying 11 and (1/2) then subtracting 6 |dw:1436912738685:dw|
laughoutloud
  • laughoutloud
so the answer to part c is |dw:1436912878418:dw|
Phebe
  • Phebe
THANKSZZ!!
laughoutloud
  • laughoutloud
No problem:)
Phebe
  • Phebe
<3
Phebe
  • Phebe
i should get a 100%
Phebe
  • Phebe
well ima go so CYA~ thanks for all tha helpz
laughoutloud
  • laughoutloud
Yep!

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