Answer:
180
Step-by-step explanation:
When you multiply the about lost per hour by the amount of time, you get the amount lost total.
6*8=48
then you add that to the amount in the pool now, and you have the original amount.
7x + 3y = 30
-2x + 3y = 3....multiply by -1
-----------------
7x + 3y = 30
2x- 3y = -3 (result of multiplying by -1)
----------------add
9x = 27
x = 27/9
x = 3
7x + 3y = 30
7(3) + 3y = 30
21 + 3y = 30
3y = 30 - 21
3y = 9
y = 9/3
y = 3
solution is (3,3)
