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math question?
Jen Butler has been pricing Speed-Pass train fares for a group trip to New York. Three adults and four children must pay $111. Two adults and three children must pay $79. Find the price of the adult's ticket and the price of a child's ticket.
1 Answer
- ?Lv 74 years ago
3x+4y = 111
2x+3y = 79
x+y = 32 ;#1-#2
2x+2y = 64 ;*2
y = 15 ; #2-#4
x = 17
x = 17 adult
y = 15 child
check
3x+4y = 111
3(17)+4(15) = 51+60 = 111
2x+3y = 79
2(17)+3(15) = 34+45 = 79