John is 5 years older than Mary. In 10 years, twice John's age decreased by Mary's age is 35, and John's age will be twice Mary's current age. Find their ages now.
If x is Mary's age now and yis John's age now, which system of equations could not be used to solve the problem?
O y=x+ 5 and 2 y + 10) = x
O y=x+ 5 and 2 y + 10)- x + 10) = 35
O y = x + 5 and y + 10 = 2x