I need help with this please

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

What is best way to getting answer for my exam is

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]