exam Maths Puzzle Numerical Ability

I am using the intercept method and I do not know the beginning this is the problem and this is what I got
2x+3y=6
3x=6-2x subtract
6-2 add from there I am lost please help me get the concept Thank you

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exam Other Question

1) ...HIS BOYHOOD LASTED 1/6 TH HIS LIFE; HE MARRIED AFTER 1/7 TH MORE; HIS BEARD GREW AFTER 1/12 MORE, AND HIS SON WAS BORN 5 YEARS LATER; THE SON LIVED TO HALF HIS FATHER'S AGE, question: 65+n=85-16+3n



Process so far:65+n=69+3n
65+n-n=69+3n-n
65=69-2n
65-2n=69+2n-2n