A group of 25 students want to see a drake concert. Tickets for members of drakes fan club cost $20 and tickets for no members cost $25. The total cost Is $550

Not drake!

m=number of members

n=number of nonmembers

n+m=25

cost=550=20m+25n

simplify by dividing by 5

110=4m+5n

so we have

n+m=25 and

5n+4m=110

multiply first eequation by - 4 and add to second equation

-4n-4m=-100

5n+4m=110+

n+0m=10

n=10

subsitute

n+m=25

10+m=25

m=15

15 members

10 non-members