Matrices
see slide 7
ON how to write your answer into the chat, see slide 6
see slide 8
Lashaunda has $50. She decides she wants to buy some video games. PC games cost $4 and Xbox Games cost $3.
Write an equation with two variables that represents the given information. Let x be he # of PC games and let y be the # of Xbox games
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4x + 3y = 50
Solve for (x,y)
y = 2x - 4
3x + y = 6
(2,0) or x = 2 and y = 0
Your choice
You may steal 100 points from another team
You can gain 125 points
Or Have another team lose 150 points
Freebie
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Omar decides he wants to invest his money into two bank accounts. The first bank account has an interest rate of 4% and the second account has an interest of 7%. At the end of the year the amount he makes on interest is $300
Write an equation with two variables that represents the given information. Let x be the amount in the first account y be the amount in the second account
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.04x + .07y = 300
Solve
2x + 4y = 10
x + 2y = 5
There are infinitely many solutions
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See slide 6 for how to write answer
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See slide 11
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See slide 12
Mei Ling goes to the store with $68. Donuts cost $5, Broccoli costs $6, and pancakes cost cost $13.
Write an equation with 3 variables that represents the given information. Let x be the amount of donuts she buys, let y be the amount broccoli she buys, let z ne the amount of pancakes she buys
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5x + 6y + 13z = 68
2x + 3y = -1
4x + 7y = -1
(-2,1)
Solve for x and y
y = 3x + 2
y = x2 + 5x + 6
(-2, -4)
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See Slide 14
Your family goes out to dinner to celebrate your jeopardy win. The cost of the dinner between 8 people cost $60. The dinner cost $5 per adult and $4 per child.
Write 2 equations with two variables that represents the given information to solve for the number of kids and adults. Let x be the amount of adults and let y be the amount of children
Go over how to write answer
x + y = 8
5x + 4y = 60
Solve for x and y
y = 3x2 + x + 3
y = 4x2 - x -5
(-2,13) (4,55)
DOUBLE POINTS
Who is the strongest SideKick of all Time.
There is only one correct answer
OBVI LUIGI
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see slide 16
Juan goes to the movies and has $80 to spend on the snacks. Popcorn costs $2, Hot Dogs cost $3, and Soda cost $4. In total he buys 8 items and he buys as much popcorn as he does hot dogs and sodas combined.
Write a system of equations of 3 variables that can solve for the number of each snack Juan bought. Let x be the # of popcorn, Let y be the # of hot dogs, Let z be the number of sodas
Go over how to write answer
2x + 3y + 4z = 80
x + y + z = 8
x = y + z
Solve for x, y and z
x + y + z = 3
2x -y + 4z =5
6x +y -3z = 4
(1,1,1)
See slide 21
See slide 22