Answer:
The rates form a proportion
Step-by-step explanation:
we know that
If two rates form a proportion
then
The two rates must be equivalent
so
[tex]\frac{7}{9}=\frac{42}{54}[/tex]
Multiply in cross
[tex]7(54)=9(42)[/tex]
[tex]378=378[/tex] ----> is true
therefore
The rates form a proportion
