PreCalc

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Storyboard Text

• I am a well known man﻿
• I am a recondite man﻿
• I am going to run west﻿
• We are going to race﻿ from this location, but run opposite directions
• I am going to run east﻿
• This race can be demonstrated through the equation: |1/3x+5|-13=-4﻿
• zoom﻿
• zoom﻿
• Oh no! The two men tied in their race, let's see if they went the same distance﻿
• In order to do this, you first add the -13 to the other side of the equation﻿
• ﻿Now you set |1/3x+5| equal to 9 and -9 because they ran opposite directions from the same location, which can be considered 0
• ﻿By plugging those values back in, you'll find that you'll get the same value, therefore the men really did tie.
• Now solve both equations normally by subtracting 5 and then multiplying by 3.  This gives you the answers 12 and -42﻿.
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