Math Subsitution Comic

Math Subsitution Comic

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Storyboard Description

Math, dues friday

Storyboard Text

  • They robbed my Taco Stand by giving me counterfeit money!
  • I'm bored. Let's go get food next-door with fake money.
  •    I know if we got three soft tacos and three burritos it would be 11.25 since I got it once
  • Let x be the taco and y be the burritos. 
  • Your bill would be 10.00 for 4 soft tacos and 2 burritos so how much are burritos and how much are tacos?
  • Let's rewrite the problem. 3x+3y=11.25 is my order 4x+2y=10 which is your order And then we have to rewrite each equation so they are in opposite terms.
  • 2[3x+3y=11.25] = [6x+6y=22.50] -3[4x+2y=10] = [-12x-6y=-30]
  • 6x+6y = 11.25 -12x-6y = 22.50 -6x = -7.50 -6 x=1.25
  • 4x+2y=10 4(1.25)+2y=10     Substitute 5+2y=10           Simplify 5-5+2y=10-5     Subtract 2y=5                2   2    Divide y= 2.5
  • Now we check it 3x+3y = 11.25 3(1.25)+3(2.5) = 11.25 3.75+7.5 = 11.25 4x+2y=10 4(1.25)+2(2.5)=10 5+5=10
  • So the price of 1 soft taco is $1.25 and the price of one burrito is $2.50
  • Let's go make some counterfeit money know that we know.
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