Final answer:
The equation representing Kylie's situation when buying glitter pens is 1.50p = 9, where p is the number of pens she can buy.
Step-by-step explanation:
The question asks us to determine the equation that represents Kylie's situation when buying glitter pens for a party. Since each pen costs $1.50 and Kylie has $9 to spend, we can let p be the number of pens she can buy and set up the equation.
To find out how many pens Kylie can buy, we multiply the number of pens, p, by the cost of each pen, which is $1.50. Kylie has $9 to spend, so we set up the equation as:
1.50p = 9
This equation tells us that the price of each pen ($1.50) multiplied by the number of pens p equals the total amount Kylie has to spend ($9).