anonymous
  • anonymous
solve system equations by substitution x+y=4 -2x-2y=-8
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
i came up with (3,1)
anonymous
  • anonymous
is that correct
anonymous
  • anonymous
in x+y = 4, minus the x from both sides, so y = 4-x, plug in 4-x into your bottom equation and solve, ... -2x -2(4-x) = -8

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anonymous
  • anonymous
once you have your x value, plug that into first equation to get your y
anonymous
  • anonymous
is it (-4,8)
anonymous
  • anonymous
no i still think its (1,3)
anonymous
  • anonymous
the answer is the identity
anonymous
  • anonymous
whats the identity
anonymous
  • anonymous
it's when there is an infinite number of solutions, not just one when you solve the equations by substitution you end up with -8=-8 which is always true
anonymous
  • anonymous
so is it (0,4) for my answer
anonymous
  • anonymous
no the answer is any set of numbers that will work in the first equation, there are an infinite number of answers such as (0, 4), (2,2), (1/2, 3 1/2), (-6, 10) all of these sets will work in the first equation and the second
anonymous
  • anonymous
thanks

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