An artist bought a set of 10 paintbrushes that contained x small paintbrushes and y large paintbrushes. The number of small paintbrushes in the set was 4 times the number of large paintbrushes in the set.

Which system of equations can be used to find the numbers of small paintbrushes and large paintbrushes in the set?

Let x represent the number of small paintbrushes and y represent the number of large paintbrushes.

The total number of paintbrushes in the set is 10:
x + y = 10

The number of small paintbrushes is 4 times the number of large paintbrushes:
x = 4y

So, the system of equations is:
x + y = 10
x = 4y