Question

Determine whether the fractions 3 4 and 4 5 are equivalent. Question content area bottom Part 1 Select the correct choice below and fill in the answer​ box(es) to complete your choice. ​(Simplify your​ answers.) A. The fractions are not equivalent because the product of the numerator of the first fraction and the denominator of the second fraction is enter your response here ​, which is not equal to the product of the numerator of the second fraction and the denominator of the first​ fraction, enter your response here . B. The fractions are equivalent because the product of the numerator of the first fraction and the denominator of the second fraction is equal to the product of the numerator of the second fraction and the denominator of the first fraction. That​ is, the cross product for each multiplication is enter your response here .

Answer 1

Answer: Choice A

The fractions are not equivalent because the product of the numerator of the first fraction and the denominator of the second fraction is   15   ​, which is not equal to the product of the numerator of the second fraction and the denominator of the first​ fraction    16    

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Explanation:

We have the template $\frac{P}{Q} = \frac{R}{S}$ which cross multiplies to $PS = QR$

So if $\frac{3}{4} = \frac{4}{5}$ was true, then $3*5 = 4*4$ must be true as well, and vice versa.

The left side 3*5 turns into 15, while the right hand side 4*4 becomes 16. The 15 and 16 don't match up.

In short, $3*5 = 4*4$ turns into $15 = 16$ which is a false statement. So the original claim that $\frac{3}{4} = \frac{4}{5}$ is also false.