ayee_ciera
  • ayee_ciera
CAN ANYONE HELP ME PLS I WILL FAN AND MEDAL TO ANYONE THT HELPS!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
ayee_ciera
  • ayee_ciera
What is the solution to the following system? 3x+=3y=10 -9x-9y=-30
FireKat97
  • FireKat97
try posting up your working so far
ayee_ciera
  • ayee_ciera
I haven't got anything im stuck

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FireKat97
  • FireKat97
okay so when you have questions like these, there are two methods you can go to; substitution method and elimination method do you know how these work?
ayee_ciera
  • ayee_ciera
yes ofc
FireKat97
  • FireKat97
okay so pick whichever one you want to use for this particular question..
ayee_ciera
  • ayee_ciera
um.. substitution?
anonymous
  • anonymous
i tink de ansa is d :)
anonymous
  • anonymous
( ͡° ͜ʖ ͡°), ( ͠° ͟ʖ ͡°), ᕦ( ͡° ͜ʖ ͡°)ᕤ, ( ͡~ ͜ʖ ͡°). ( ͡o ͜ʖ ͡o), ͡° ͜ʖ ͡ -, ( ͡͡ ° ͜ ʖ ͡ °)
anonymous
  • anonymous
wheere's mey medal ?
anonymous
  • anonymous
de ansa us d
anonymous
  • anonymous
cun i huve my medul?
anonymous
  • anonymous
( ͡° ͜ʖ ͡°), ( ͠° ͟ʖ ͡°), ᕦ( ͡° ͜ʖ ͡°)ᕤ, ( ͡~ ͜ʖ ͡°). ( ͡o ͜ʖ ͡o), ͡° ͜ʖ ͡ -, ( ͡͡ ° ͜ ʖ ͡ °)
anonymous
  • anonymous
( ͡o ͜ʖ ͡o)
FireKat97
  • FireKat97
okay so if you want to substitute, write either one of the two equations in the form of y = ... or x = ....
ayee_ciera
  • ayee_ciera
but how?
FireKat97
  • FireKat97
okay so say we pick the first equation and want to write it in terms of x... so 3x + 3y = 10 we want to isolate x, do you have any ideas how we may do so?
ayee_ciera
  • ayee_ciera
plug in -9x...?
FireKat97
  • FireKat97
um no, we want x by itself, so we can start off by subtracting 3y from both sides of the equation, to get 3x + 3y - 3y = 10 - 3y and now we simplify..
FireKat97
  • FireKat97
so we get 3x = 10 - 3y
ayee_ciera
  • ayee_ciera
can it also be 3x=3y+10?
ayee_ciera
  • ayee_ciera
@FireKat97
FireKat97
  • FireKat97
no because we subtracted 3y from the right hand side, we didn't add it
FireKat97
  • FireKat97
because only through subtracting 3y from both sides, could we cancel 3y on the left hand side and try to isolate the x
ayee_ciera
  • ayee_ciera
so we divide 10-3y by 3x? @FireKat97
FireKat97
  • FireKat97
close.. we divide it by 3 alone :)
FireKat97
  • FireKat97
that way we get x = (10 - 3y)/3
ayee_ciera
  • ayee_ciera
\[x=\frac{ 10-3y }{ 3 }\]
ayee_ciera
  • ayee_ciera
@FireKat97
FireKat97
  • FireKat97
yup thats correct! Now we want to substitute this into our second equation and simplify..
ayee_ciera
  • ayee_ciera
\[-9(\frac{ 10-3y }{ 3 })-9y=-30\] so tht? @FireKat97
FireKat97
  • FireKat97
Yup! thats right! now we have to simplify
ayee_ciera
  • ayee_ciera
\[-9(\frac{10-3y }{ 3 })-9y=-30\] \[-21y-9y=-30\] \[+9y+9\] -30=-30 @FireKat97
FireKat97
  • FireKat97
umm let start off by opening and simplifying the brackets first, so just simplify -9(10 - 3y( and tell me what you get
FireKat97
  • FireKat97
)*
ayee_ciera
  • ayee_ciera
-21 @FireKat97

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