sarah took the advertising department from her company on a round trip to meet with a client. including sarah a total of 15 people took the trip.she was able to purchase coach tickets for $150 and first class tickets for $1140.she used her total budget for airfare for the trip,which was $11,160.how mny first class tickets did she buy? how many coach tickets did she buy?

Question

mertsj · Answer

c+f=15
150c+1140f=11,160

Solve the system c = coach    f = first class

erniellyd28 · Answer

this is where i get lost and or confused

mertsj · Answer

1.  Divide the second equation by 10
2.  Multiply the first equation by -15
3.  Add the two resulting equations
4.  Solve the resulting equation for f
5.  Subtract f from 15 to find c

erniellyd28 · Answer

for the second equation i got 1116

erniellyd28 · Answer

for the first equation i got -225

mertsj · Answer

1116 is not an equation

mertsj · Answer

What did you get when you divided the second equation by 10?

erniellyd28 · Answer

1116

erniellyd28 · Answer

am i wrong?

mertsj · Answer

yes.

erniellyd28 · Answer

where did i mess up?