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HELPZZ http://prntscr.com/7sq0eu

Mathematics
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Do you know what two methods there are?
No well one is the matrix method i think

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Other answers:

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

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