PLEASE HELP THIS IS FOR MY MATH PROJECT
A family with 3 adults and 3 children purchase 6 lines each for $35 at ATT. Another family with 2 adults and 4 children purchase 6 lines each for $25 at A-Mobile. How much will the adults’ lines cost at both companies?

we had to come up with our own systems and this is the word problem i chose. does it work?