Gabby is twice as old as Kassy, and Kassy is four years older than Taylor. The sum of their ages is 24. Find their ages.

Taylor: x. Equation:

Kassy:

Gabby:

Solution:

Casey correctly wrote and solved a system of linear equations by substitution. In his work, he substituted an expression for one variable and solved for the other. This resulted in the equation 5 = 20. What can Casey conclude?

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