Answer:
Sedan: 4 passengers
Minivan: 6 passengers
Step-by-step explanation:
We can write the following system of equations:
, where
represents the number of people a sedan can seat and
represents the number of people a minivan can seat.
Subtracting the first equation from the second, we have:

Now plug in
in any of the equations to solve for
:

Verify that the solution pair
works:

Therefore, a sedan can hold 4 passengers and a minivan can hold 6 passengers.