Question

A piano teacher charges students $20.25 each month, plus $5.25 per hour for lessons.

Answer 1

Answer:

99$

Step-by-step explanation:

you take the 5.25$ per hour and multiply it by the 15 hours, and then you add the 20.25$ per month

Answer 2

Answer:

suppose the number of 2 hours lessons are x and 1 hour lessons are y; thus,

2x+y=25

50x+30y=690

to get the values of x and y we solve the quadratic equation given;

from the top equation:

y=25-2x.......i

substituting i in our second equation we get:

50x+30(25-2x)=690

50x+750-60x=690

-10x=-60

thus;

x=6

hence we conclude that the number of 2 hours classes are 6 hours

Step-by-step explanation: