SOLUTION: 180 TICKETS SOLD = $1620 HOW MANY $10 tickets and $7.50 tickets

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Question 418511: 180 TICKETS SOLD = $1620 HOW MANY $10 tickets and $7.50 tickets
Answer by mananth(16949) About Me  (Show Source):
You can put this solution on YOUR website!
$ 10 tickets x
$ 7.50 tickets = y
Total ticket = 180
value = 1620
x+y=180 .............1
10x+7.5 y=1620 .............2

multiply (1)by -7.5
Multiply (2) by 1
-7.5x-7.5y=-1350
10x+7.5y=1620

Add the two equations

2.5x=270

/2.5

x=108

plug value of x in (1)

1x+y=180
108+y=180
y=180-108
y=72