# Math

More Options: Make a Folding Card

#### Storyboard Description

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#### Storyboard Text

• Kif goes to an amusement park at different times during a week. The price of each ride is \$6 on a weekend and \$9 on the weekdays.
• Inverse of matrix:﻿
• Kif goes on 19 rides in total which cost him \$135. Kif used the money given to him to buy office supplies to pay for the weekday trips and used his own money for the rest.
• Kif's boss find out that kif used the money given to him ﻿for something else and demands Kif to pay him back the money. Kif must calculate how much money he spent on each part of the week to pay back his boss.
• matrix equation
• 1    1 6﻿    9
• System of equations: x+y﻿=19 6x+9y=135
• .﻿
• =﻿
• x y
• 19 135
• 1/(9-6)﻿
• 9    -1 -6﻿    1
• =﻿
• x y
• 3    -1/3 -2   1/3
• 1    0 0    1
• .﻿
• .﻿
• 12 7
• =﻿
• x y
• 1    1 6﻿    9
• .﻿
• 12 7
• =﻿
• x y
• 3    -1/3 -2   1/3
• .﻿
• 19 135
• Thank you for returning the money back. I hope you learned your lesson ﻿