Let \( x \) be the number of hot dogs sold, and \( y \) be the number of pretzels sold.
We have the following two equations based on the problem:
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The total number of items sold (hot dogs and pretzels) must equal 300: \[ x + y = 300 \]
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The total income from selling hot dogs and pretzels must equal $800: \[ 4x + 2y = 800 \]
Now, we will solve this system of equations.
From the first equation, we can express \( y \) in terms of \( x \): \[ y = 300 - x \]
Now, substitute this expression for \( y \) into the second equation: \[ 4x + 2(300 - x) = 800 \]
Distributing the 2: \[ 4x + 600 - 2x = 800 \]
Combining like terms: \[ 2x + 600 = 800 \]
Subtract 600 from both sides: \[ 2x = 200 \]
Dividing both sides by 2 gives: \[ x = 100 \]
Now, substitute \( x = 100 \) back into the equation for \( y \): \[ y = 300 - 100 = 200 \]
Thus, the Baynard High School Boosters need to sell 100 hot dogs and 200 pretzels to reach their goal of $800.
The answer is: 100 hot dogs and 200 pretzels