To find out how many ornaments Joy will make this weekend, we first need to determine her ornament-making rate based on the time she spent yesterday.
Joy made 2 ornaments in 6 hours. To find her rate of making ornaments, we calculate:
\[ \text{Rate} = \frac{\text{Number of ornaments}}{\text{Time in hours}} = \frac{2 \text{ ornaments}}{6 \text{ hours}} = \frac{1 \text{ ornament}}{3 \text{ hours}} \]
This means Joy makes 1 ornament every 3 hours.
Next, we need to determine how many ornaments she can make in the 15 hours she plans to work this weekend. We can first find how many 3-hour intervals are in 15 hours:
\[ \text{Number of intervals} = \frac{15 \text{ hours}}{3 \text{ hours per ornament}} = 5 \]
Since she completes one ornament in each 3-hour interval, the number of ornaments Joy can make in 15 hours is:
\[ \text{Number of ornaments} = 5 \]
Thus, Joy will make a total of 5 ornaments this weekend.