I think its like if you got 80% on a quiz and 20% on the exam then your grade would be 60% which is usually a F
3x+y=9 ....(1)
3x-5y=15. ......(2)
-[3x-5y=15]
=> 3x+ y = 9
-3x+5y=-15
..........................
0 +6y=-6
so,y=-1
3x+(-1)=9
3x=10
x=10/3
Divide 8 by 6 and you will get 1 and 1/3 pounds per dog. You can draw 6 dogs, then equally assign the pounds of dog food to each dog. I would not recommend this technique, however.
15 hundreds (I’m pretty sure).