NEED ANSWER ASAP OFFERING 100 POINTS

Which properties justify the steps taken to solve the system?


{2a+7b=03a−5b=31


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10a+35b=0; 21a−35b=217

​31a = 217

a = 7

2(7)+7b=0

14 + 7b = 0

7b=−14

b=−2