Answer:
1. unsure?
2. unsure?
3. the 3 is the number of gallons, and the "d" is the cost per gallon.
the g is the number of gallons and the "3" is the cost per gallon.
Explanation:
3g + d = (something).
g + 3d = (something).
Let's multiply every number by 2 as example.
6g + 2d = 2
2g = 6d = 2
(change it to x and y)
6x + 2y = 2
2x + 6y = 2
(0.25, 0.25)