To find the total cost of a large pizza with 3 additional toppings using the equation \( y = 11 + 1.5x \):
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Substitute \( x \) with the number of toppings (3): \[ y = 11 + 1.5(3) \]
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Calculate \( 1.5(3) \): \[ 1.5 \times 3 = 4.5 \]
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Now substitute back into the equation: \[ y = 11 + 4.5 = 15.5 \]
So, the cost of a large pizza with 3 toppings is $15.50.