Plz need help will give brainliest

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

An empty bucket is placed under a faucet dripping at a constant rate of 4 milliliters per minute. with the given information, which of these statements is a reasonable conclusion? a there will be 24 milliliters of water in the bucket after 16 hour. b there will be 60 milliliters of water in the bucket after 14 hour. c there will be 160 milliliters of water in the bucket after 20 minutes. d there will be 100 milliliters of water in the bucket after 40 minutes.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.