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QR Challenge: Substitution

QuestionAnswer
What is the first step using substitution? y = 2x and x + 3y = 14. x + 3(2x) = 14
What is the first step using substitution? x = y - 3 and 5x + 3y = 1. 5(y-3)+3y=1
What is the first step using substitution? y= - 4x and 6x + y = 6. 6x + (-4x) = 6
What is the first step using substitution? 2x - 3y = 9 and x = 2y + 2. x
Solve for (x, y) using substitution: y = 2 - x and 5x + 4y = 5 (-3, 5)
Solve for (x,y) using substitution: y = 5x - 9 and x = y + 5 (1, -4)
Solve for (x,y) using substitution: y = 2x and x + 3y = 14 (x,y)
Solve for (x,y) using substitution: x = y - 3 and 5x + 3y = 1 (x,y)
Solve for (x,y) using substitution: y = -4x and 6x + y = 6 (x,y)
Solve for (x,y) using substitution: 2x - 3y = 9 and x = 2y + 2 (x,y)
Solve for (x,y) using substitution: 3x - y = 7 and y = 2x - 4 (x,y)
Solve for (x,y) using substitution: x = 2y + 7 and 3y - x = 8 (x,y)
Solve for (x,y) using substitution: y = x - 4 and 2x - 3y = 11 (x,y)
Captain America saw the equations 5x + y = 10 and y = 3 - x. His end result was 5(3 - x) + y = 10. What did he do wrong? He replaced the x instead of the y.
Ms. Chan was solving the equations y = 2x and y + x = 1. She then got y + 2x = 1. Is she right? Why or why not? N/A
Beyonce had the equation y = 2x + 3 and y = -x - 4. Do you think should she graph them? Or should she use substitution? Which do you think is less work? N/A
Batman says “I’m Batman”. He also says there’s only one way to solve the equations 2x - 3y = -2 and y = -4x + 24. Is he right? no, he could graph them or use substitution.
Solve for (x,y) using substitution: y = 10 - 2x and 3x - 2y = 22 (x,y)
Solve for (x,y) using substitution: 2x - 3y = -2 and y = -4x + 24 (x,y)
Solve for (x,y) using substitution: y = 50x + 4 and y - 32x = 40 (x,y)

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