Kaivon D.

asked • 11/22/19

Solving Systems Using Elimination: In a class, 45 students take the SAT exam. The number of boys is 8 more than the number of girls. (question in the description)

a. Write a system that models the above situation.

b. Do you need to multiply any of the equations by a constant? If so, which equation an what is the constant?

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David W. answered • 11/22/19

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b + g = 45

b = g + 8


b + g = 45

b - g = 8


No, because g and -g already cancel out.

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Edythe C.

This is fine except for one "real world" thing: you CAN'T get part of a person in the answer. This works out to 2b = 53 or the number of boys is 26.5. Is there a typo in the problem?
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11/25/19

David W.

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Note: It doesn't say to SOLVE; it says set up a system of equations. Solving will get you a goofy answer, but the point is moot.
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11/25/19

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