There is 7.5 killograms in 7500 grams.
0.001 killograms are in a gram, so I did 0.001 x 7500
7x+2y=3 | ×3
x-3y=30 | ×2
21x + 6y = 9
2x - 6y = 60 +
--------------------------
23x / = 69
x = 69:23
x = 3
7x + 2y = 3
21 + 2y = 3
2y = -18
y = -9
I think its not a right triangle because of the cm.
If 1 bottle is $2, you would multiply $2 by 12, giving you $24. 2 Dollars:1 Bottle = 24 Dollars:12 Bottles