TEKS.MATH.8.9A

Caitlin won a bag full of money! She has 49 bills in all. She counts $1,430. There are $20 dollar bills and $50 dollar bills. How many of each bill does Caitlin have?
WRITE a system where T= # of $20 and F = # of $50.

• T + F = 1430
  20T + 50F = 49
• T+ F = 49
  10T + 5F = 1430 
• T + F = 49
  20T + 50F  = 1430
• T + F = 49
  T + F = 1430

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TEKS.MATH.8.9A

A system of linear equations is... 

• Math Magic
• One Equation
• Always more than 2 equations
• A set of 2 or more equations

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TEKS.MATH.8.9A

What are the x- and y -intercepts on this graph?

• (0,5), (0,5)
• (5,0), (5,0)
• (5,0), (0,5)
• (0,0), (5,0)

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TEKS.MATH.8.9A

What is the solution to this equation?

• one solution
• no solution
• infinite solutions
• none of these

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TEKS.MATH.8.9A

Solve the system of equations by graphing.
y = -4x + 5
y =  3x - 16

• (-3, -25)
• (3,-7)
• (11, 17)
• (21, 47)

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TEKS.MATH.8.9A

Alexandra finds that she can give 3 haircuts and 2 hair dyes in 315 minutes. Giving 2 haircuts and 4 hair dyes takes 450 minutes.  Which system of equations represents the situation?

• 3x + 2y = 315
  2x + 4y = 450
• 3x + 2y = 450
  2x + 4y = 315
• 2x + 2y = 315
  3x + 4y = 450

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TEKS.MATH.8.9A

Find the y - intercept

• 2
• 1
• -2
• there is no y-intercept

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TEKS.MATH.8.9A

What is the solution to this system of equations?

• (4, -1)
• (-1, 4)
• (-4, 1)
• (-4, -1)

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TEKS.MATH.8.9A

Solve using Elimination method.

-3x - 9y = 15

x +3y = - 5

• Infinitely Many Solutions

• No Solution

• (0,0)

• (15,0)

• (3,9)

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TEKS.MATH.8.9A

y = x + 3

y = x + 3

What is the solution?

• No Solution

• Many Solutions (0 = 0)

• (3,0)

• (0,3)

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TEKS.MATH.8.9A