Solution: Alyssa is incorrect.
In fact [tex]\frac{6}{8}=\frac{9}{12}[/tex].
If we cross-multiply the above equation, we have:
[tex]6 \times 12 = 9 \times 8[/tex]
[tex]72 = 72[/tex]
Therefore, they are equal.
Also, if we reduce the given fractions, we have:
[tex]\frac{6}{8} =\frac{3}{4}[/tex]
And
[tex]\frac{9}{12}=\frac{3}{4}[/tex]
Since both the fractions reduced to [tex]\frac{3}{4}[/tex], therefore fractions are equivalent.