Tom does not realy want to give away blue marbles and he would change the probability rhat he chooses a blue marble to 1\10. How many marbles could he add to the bag so that the probability would be 1\10

The first equation is

y = 6x - b

For the system to have an infinite number of solutions, both equations must be the same equation.

Solve the second equation for y.

-3x + 1/2 y = -3

1/2 y = 3x - 3

y = 6x - 6

Compare this with the first equation,

y = 6x - b

That means b = 6