When attempting to do her homework, Katie incorrectly uses the multiplication property of equality. Which of the statements below describes Katie’s error?
3r = 2
r = 1
A.
Katie should have used the addition property of equality instead.
B.
Katie did not keep the equation balanced because she did not multiply both sides of the equation by the same value.
C.
Katie did not isolate the variable r.
D.
Katie should have multiplied both sides of the equation by .

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I am going with D. She should have multiplied both sides of the equation by 1/3.

I suppose it could also be B. I don't really know how she got r = 1 ?

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