Let the regular price of each ticket be \( p \).
Since the tickets are on sale for $1.50 off, the sale price of each ticket is \( p - 1.50 \).
Dea buys 6 tickets, and her total cost is $51. We can write the following equation:
\[ 6(p - 1.50) = 51 \]
Now, let's solve the equation step by step:
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Distribute the 6: \[ 6p - 9 = 51 \]
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Add 9 to both sides: \[ 6p = 51 + 9 \] \[ 6p = 60 \]
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Divide both sides by 6: \[ p = \frac{60}{6} \] \[ p = 10 \]
So, the regular price of each ticket is $10.
In simpler words, the regular price of each baseball ticket is $10. Dea got a really good deal since she bought them for cheaper, but the original price was $10.