Answer: One adult ticket is $4. One child ticket is $7
Step-by-step explanation:
Day 1:
2a + 10c = 78
Day 2:
8a + 5c = 67
2a + 10c = 78
8a + 5c = 67
Multiply Day 2 by 2 so we get the 'c' equal so we can subtract them:
Day 2: 16a + 10c = 134
Day 1: 2a + 10c = 78
Minus Day 2 from Day 1
= 14a = 56
56 / 14 = 4
So A = 4
Now substitute 4 for A in Day 1
2(4) + 10c = 78
8 + 10c = 78
10c = 78 - 8
10c = 70
c = 70 / 10
c = 7
