Answer:
Adults cost $4, and Students $2.
Explanation:
I have adults be x, and Students y, and convert the two groups to equations.
1x + 4y = 12, and 3x + 3y = 18. I divide the last equation by 3, to get x + y = 6.
Then I subtract y, to get x = 6 - y, then we use substitution.
6 - y + 4y = 12
6 +3y = 12, then subtract 6 from both sides, 3y = 6. divide by 3, and get y = 2. we can plug this into our x + y = 6, to get x + 2 = 6. i.e x = 4.
So Adults cost 4 dollars, and Students cost 2 dollars.
Just lots of simple math, take your time with these questions.