Help this is due in 10 mins

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

In the film, zeke the zombie slayer versus the zombies from space, zeke slayed 140 zombies. in the sequel, zeke the zombie slayer versus the zombies from space, part 2, he slayed 5% more zombies. how many zombies were slain by zeke in the sequel?

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