Dawson practices soccer for 30 minutes each weekday. The expression 30x can be used to find the total number of minutes Dawson has practiced soccer. What does “x” represent in this expression? ANSWER CHOICES:

A)The number of minutes Dawson practiced each weekday.
B)The number of days Dawson practiced.
C)The total number of minutes Dawson practiced.
D)The length of Dawson’s practices

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.