anonymous
  • anonymous
y = 4x + 9 y = x solve by substitution. please help!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
since y = x you can write x for y in the first equation x = 4x + 9 x - 4x = 9 -3x = 9 x = -3
anonymous
  • anonymous
how did you get -4 ?
anonymous
  • anonymous
and -3x ?

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anonymous
  • anonymous
got it , thank you!!!!!!!!!!! :)
anonymous
  • anonymous
i need help in one more question, if you have time?
anonymous
  • anonymous
ya
anonymous
  • anonymous
y = -3x - 5 y = 4x + 9
anonymous
  • anonymous
be right back, but you can show me how to do it, and ill give u a medal when i come back (10 mins) thank you!
anonymous
  • anonymous
we can calute be substitution method ....4x+9=-3x-5 4x-3x=-5-9 x=-14 now we get x=-14 put the vaue of x we get value of y\].
anonymous
  • anonymous
@justinee u undrstand
anonymous
  • anonymous
yes, but why is it 4x - 3x ?

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