A pencil at a stationery store costs $1, and a pen costs $1.50. Stella spent $21 at the store. She bought a total of 18 items. Which system of equations can be used to find the number of pencils (x) and pens (y) she bought? (5 points)

Question

A: x + 18y = 21
x = 1.5y

B: 18x + y = 21
x = 1.5y

C: x + 1.5y = 21
x + y = 18

D: 1.5x + y = 21
x = 18y

Answer 1

The correct system of equations would be:

x + y = 18
1x + 1.5y = 21

Therefore, the answer is C.