Which of these systems of linear equations has no solution?
2x+8y =15
4x+10y =30
2x-y=18
4x+ 2y = 38
4x+7y= 17
8x-14y - 36
4x-3y = 16
8x-by = 34

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

hope this < 3

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)