Which pair of lines is perpendicular?
a. y=2x-1 and 2y=-x+3
b. y=3x+4 and 3y-x=5
c. y=-4x+2 and x+4y=6
d. y=-6x-3 and 6x-y=4

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