To represent the constraints of Amy's scenario as a system of inequalities, we need to consider the two given conditions: the relationship between the number of pencils and notebooks, and the budget constraint.
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The first condition states that the number of pencils (p) needed is at least twice the number of notebooks (n). This can be expressed as:
\[ p \geq 2n \]
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The second condition relates to the budget. The cost of pencils is $0.25 each and the cost of notebooks is $4 each. Therefore, the total cost can be expressed as:
\[ 0.25p + 4n \leq 100 \]
Combining these two inequalities, we get the following system of inequalities to represent the constraints:
\[ \begin{align*}
- & \quad p \geq 2n \
- & \quad 0.25p + 4n \leq 100 \end{align*} \]
Additionally, since quantities of pencils and notebooks can't be negative, we can include non-negativity constraints:
\[ p \geq 0 \quad \text{and} \quad n \geq 0 \]
Thus, the complete system of inequalities is:
\[ \begin{align*}
- & \quad p \geq 2n \
- & \quad 0.25p + 4n \leq 100 \
- & \quad p \geq 0 \
- & \quad n \geq 0 \end{align*} \]