To set up the system of equations for the problem, we need to account for both the total cost and the total number of items bought.
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The first equation represents the total number of items (pens and markers): \[ p + m = 19 \]
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The second equation represents the total cost: \[ 0.25p + 0.75m = 11.50 \]
So the responses to fill in the system of equations are:
For the first equation: \[ p + m = 19 \]
This means you will input "19" in the response area for the first equation.
For the second equation, you didn't ask for an input, but it would be: \[ 0.25p + 0.75m = 11.50 \]
In summary, the correct input for your first equation is:
19