I need help on this math question Please

Carson has only $20 bills and $10 bill in her wallet. the total value of the bills is $50. she has 1 more $20 bill than $10 bills. how many each kind of bill does carson have? a. one $20 and two $10 bills b. two $20 bills and one $10 bill c. one $20 bills and three $10 bills d. two $20 bills and two $10 bills

3x + 4y = 5 x- 3y = -7 solve by substitution

For the feasibility region shown below find the maximum value of the function p=3x+2y