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sommersquid
Group Title
What is the value of the x variable in the solution to the following system of equations?
7x  2y = 21
4x + y = 57
 2 years ago
 2 years ago
sommersquid Group Title
What is the value of the x variable in the solution to the following system of equations? 7x  2y = 21 4x + y = 57
 2 years ago
 2 years ago

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iheartfood Group TitleBest ResponseYou've already chosen the best response.0
ummm is this algebra 2?
 2 years ago

sommersquid Group TitleBest ResponseYou've already chosen the best response.0
algebra 1, 2nd year taking it again
 2 years ago

sommersquid Group TitleBest ResponseYou've already chosen the best response.0
once i find the y , i put it in the the first equation right?
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
I think so... i asked somebody if they could come and help since I need to understand this better as well since i sort of forgot haha :)
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
sorry hold on lemme see if that person will come... ;/
 2 years ago

sommersquid Group TitleBest ResponseYou've already chosen the best response.0
okay thank you (:
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
Hi @jim_thompson5910 thanks for coming :) I also do not understand this 100% haha :) u got my message then i take it? :)
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
double everything in the second equation to get 8x + 2y = 114
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
sorry (email)
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
and hi @apoorvk thanks for coming also!!! i appreciate it :)
 2 years ago

apoorvk Group TitleBest ResponseYou've already chosen the best response.0
ohkay, @iheartfood  go on and post what you would have done in this problem, and don't worry if it's right or wrong.. :)
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
Now add the two equations 7x  2y = 21 8x + 2y = 114  15x + 0y = 135 Now solve 15x = 135 for x
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
well i know you're supposed to solve for one, but i did not know you could do that (what @jim_thompson5910 wrote.... so that is another way you can do it??
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
is that how you do it?? simplify it into one larger equation??
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
that's one way to do it, there is more than one way
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
okay, what's another way to do it?? i think i remember that you can solve one equation and then plug it in but i couldn't do it for this one... ;/
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
you isolate one variable in terms of the other then you substitute 4x + y = 57 y = 57  4x  7x  2y = 21 7x  2(574x) = 21 Now solve for x
 2 years ago

sommersquid Group TitleBest ResponseYou've already chosen the best response.0
x = 9 for my problem right? (:
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
oh okay cool :) soooo x=45??
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
you are correct, the answer to the first piece is x = 9
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
oops my bad nvm lol
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
hmm how did you get x = 45?
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
now that you know that x = 9, use this to find y
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
sorry by bad... lol it's 9 sorry!!
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
sooo you plug it in right??
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
so y=21 ???? and x=9 ???
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
yes, pick any equation dealing with y and plug in x = 9 7x  2y = 21 7(9)  2y = 21 Solve for y
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
and yes, y = 21
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
oh i used the second equation.. haha but it works both ways :) u get the same answer for both right?
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
oh the question was just "What is the value of the x variable in the solution to the following system of equations?" so they just want x Usually, they'll want both x and y
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
yes either equation works
 2 years ago

iheartfood Group TitleBest ResponseYou've already chosen the best response.0
oh okay cool! thanks!! i totally understand it now... :) what a refresher!! And @sommersquid did that help??? And thanks again for coming @jim_thompson5910 :)
 2 years ago

sommersquid Group TitleBest ResponseYou've already chosen the best response.0
yesss, it really did (: i just needed help with the second step but i got it now (: thank you so much everyone
 2 years ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.3
yw
 2 years ago
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