x = days renting the truck
y = fee
x + y = 34
2x + y = 56
By using Elimination , we can subtract or add both equations so we can isolate a variable:
Lets isolate y for example
Subtracting
2x - x + y - y = 56 - 34
x = 22
Then plugin x (22) to one of the equations
22 + y = 34
y = 12
The awnser is c) 22d + 12
