Please help me ASAP.

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

Examine the following sets of events. set a: {1, 5, 7, 9, 14} set b: {2, 5, 6, 8, 14, 17} which of the following represents the intersection of set a and set b ? {∅} {5, 14} {1, 2, 5, 6, 7, 8, 9, 14, 17} {1, 2, 6, 7, 8, 9, 17}

When only separate discreet points are graphed it is called?