I need help with this problem, it's a select multiple with 8 to choose from, please put the answer by saying which letters it is for the multiple-choice. I will give brainliest. You are trying to figure out what a could be without multiplying. Select each value of a for which you can solve the system by elimination without multiplying first.

ax−7y=−13
8x−6y=−2
option a. -7
option b: 42
option c: -6
option d: 6
option e: -2
option f: -8
option g: 8
option h: 7

Write in the answer area like this, for example:

option b, option e, option h.