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Police arrest two people involved in a crime. The combined age of the two criminals is 67 years. One of the criminals is 29 years older than the other. Let x and y be the ages of the criminals, measured in years. Which two equations can you use to solve for x and y?
x: age of older criminal y: age of younger criminal

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Ax + y = 29 and x - y = 67
Bx + y = 67 and x -y = 29
Cx + y = 67 and y - x = 29
Dx + y = 29 and y - x = 67