Please answer these two questions for me

These question are hard can you me with answers

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?