Let \( p \) represent the regular price of each ticket. Since the tickets are on sale for $1.50 off, the sale price per ticket is \( p - 1.50 \).
Dea buys 6 tickets, and her total cost is $51. Therefore, we can set up the equation:
\[ 6(p - 1.50) = 51 \]
Now, we will solve for \( p \):
-
Distribute 6: \[ 6p - 9 = 51 \]
-
Add 9 to both sides: \[ 6p = 60 \]
-
Divide by 6: \[ p = 10 \]
Thus, the regular price of each ticket is \( \boxed{10} \).
In summary, the regular price of each ticket is $10.