Question 270704
There were 200 tickets sold for Mr. Rustin. Tickets were $1.50 for students and $3.00 for adults. The total amount collected was $495. How many of each type of ticket were sold? 
(Here is what I tried:)
Variables:
s= student tickets
a=adult tickets 
$1.50s+$3.00a=$495
s+a=$200 
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What you have is the right approach, you were just one step away
s + a = 200 (not dollars)
--> s = 200 - a
Then sub for s into the 1st eqn
1.5(200-a) + 3a = 495
300 + 1.5a = 495
1.5a = 195
a = 130
s = 70