Answer:
5,7=48
Explanation:
7,3=32
7*3=21; 7+3=10;21+10=31;31+1=32
10,6=77
10*6=60; 10+6=16; 60+16=76;76+1=77
8,2=27
8*2=16;8+2=10;16+10=26;26+1=27
5,7=?
5*7=35;5+7=12;12+35=47;47+1=48
I just use guess and check (you have to guess and then see if it makes sense to all the other clues)