To find out how many games Meredith needs to play to reach 358 tickets, we can use the equation given:
\[ y = 6x + 250 \]
where \( y \) is the total number of tickets needed (358) and \( x \) is the number of games played.
We can substitute \( y \) with 358:
\[ 358 = 6x + 250 \]
Next, we will solve for \( x \):
- Subtract 250 from both sides:
\[ 358 - 250 = 6x \]
\[ 108 = 6x \]
- Now, divide both sides by 6:
\[ x = \frac{108}{6} \]
\[ x = 18 \]
Therefore, Meredith needs to play 18 games to earn enough tickets for the prize.