Answer:
Yes, they are.
Step-by-step explanation:
1. - If they're equivalent, we can multiply 3 and 7 by the same number to obtain 18 and 42 respectively, and we can also divide 18 and 42 by that same number to obtain 3 and 7 respectively.
2. - Also, the result obtained by dividing 7 by 3 and 42 by 18 will be the same.
Demonstration:
1. -

2. -

Hope it helped,
BioTeacher101