system of equations

system of equations
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Storyboard Text

  • We have $42 in total to spend in the toy store, we have 22 bills in total.
  • All of our bills are either $5 or $1 bills.
  • We need your help to help us figure out how many 5 dollar bills and 1 dollar bills we have
  • But don't worry I have a friend that will help you figure it out!
  • So first your going to want to set up and equation to help you solve this!!!
  • your going to be using substitution to figure out this problem.
  • Hint x= 5 dollar bills and f= 1 dollar bills 
  • Now you'll need another equation to help you find the variable in the first one
  • Here's a hint the equation is x+f=22!! move that around and then plug it into the first equation 
  • you're equation should be 5x+1f=42
  • You should have gotten f=17, which mean I have 17 1 dollar bills. wow you're super smart.
  • One you plug it in you'll combine common variable and then divide to find x 
  • WOW you're right I have 5 5 dollar bills 
  • Now that you have found f you can plug that back into the second equation which should give you x+17=22
  • Look you did it thanks for helping me solve this problem.
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