anonymous
  • anonymous
please help!? <3 If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation. x + y = 2 3x + 2y = 9 choices: 3(y + 2) + 2y = 9 3(–y + 2) + 2y = 9 3x + 2(y + 2) = 9 3x + 2(–y + 2) = 9 I think it might be C...but I'n most likley wrong.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
AravindG
  • AravindG
ok can you first tell me what x and y are from first equation?
anonymous
  • anonymous
uhm... 1?

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AravindG
  • AravindG
x + y = 2 write x in terms of y and y in terms of x
AravindG
  • AravindG
x=? y=?
anonymous
  • anonymous
3(2-y)+2y = 9 x + y = 2 x = 2 - y 3(2-y) + 2y = 9
anonymous
  • anonymous
I don't understand.
anonymous
  • anonymous
let x=(2-y) 3x + 2y = 9 .............eqn 2 put d value of x in eqn 2 3(2-y) + 2y=9 6-3y+2y=9 6-y=9 y=-3
anonymous
  • anonymous
so avin y as -3 in eqn 2 3x+2(-3)=9 3x-6=9 3x=15 x=5

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