Solve the equation simultaneously
3x+4y-z=19
5x+2y+z=15
2x+3y+2z=11.
Find x+y+z

The unpaid balance on a mastercard charge was $1,056.23. during the month, payments of $300 and $250 were made and charges of $425 and $274.16 were added. if the finance charge is 1.2% per month on the unpaid balance, find the new balance at the end of the month. $1,205.39 $1,218.06 $918.06 $1,768.06