anonymous
  • anonymous
How do I find the price of a cd if 3 cd + 2 DVD=$67. And 2cd+4dvd=$90 ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
looks to me like you will have to set up a system of equations and use either the elimination methode or the subtution methode to solve this problem
anonymous
  • anonymous
zbay is exactly correct. But if you have a graphing calculator, you could set up a matrix.
anonymous
  • anonymous
I set up a graph but got stuck

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anonymous
  • anonymous
do it this way 3c+2d=67 2c+4d=90
anonymous
  • anonymous
there is your system of equations
anonymous
  • anonymous
I tried that too but got stuck
anonymous
  • anonymous
Ok where did you get stuck at? and what methode were you trying?
anonymous
  • anonymous
I tried both. I set up a chart but sine the two are not right next to each other on the chart I got stuck.
anonymous
  • anonymous
Oh it's been a while for me but lets try this together
anonymous
  • anonymous
Ok!
anonymous
  • anonymous
Ok, first we want to pick a varible and make it an oppisite inverse of the other equation i am going to do this by multiplying the top function by -2
anonymous
  • anonymous
(-2)(3c+2d=67) -6c-4d=-134
anonymous
  • anonymous
Do u know how to do it using a graph? Btw thanks for all your help.
anonymous
  • anonymous
-6c-4d=-134 2c+4d=90 No i don't think i know how to do the graph
anonymous
  • anonymous
Ok that is fine
anonymous
  • anonymous
when we combine them we get (-4c=-44)
anonymous
  • anonymous
d= 11
anonymous
  • anonymous
Your awesome ,,, thanks
anonymous
  • anonymous
c=15
anonymous
  • anonymous
ok after you have your d value plug it into your orginal equation and solve for c
anonymous
  • anonymous
Got it:)

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