To help his family, David sells bottled water in the morning. He gets Php3 per bottled water sold and Php 20 a day tip from the supplier.

9. Which linear function represents the given problem if x is the number of bottled water sold and y is the amount he earns?

A. y = 20 x + 3
B. 3y = x + 20
C. y = 3x + 20
D. 20y = x + 3

10. How much does he earns if he sells 25 bottled water in one day?

A. Php 65
B. Php 85
C. Php 75
D. Php 95​