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a*b=z
a: primer número, b: segundo número, z: producto a*b
(a+2)(b+1)= z+23
ab +a+2b+2=z+23
(a+1)(b+2)= z+29
ab+2a+b+2= z+29
ab +a+2b+2=z+23 Se multiplica éste por (-1) para poder restarlo del otro.
ab+2a+b+2= z+29
Queda así:
ab+2a+b+2= z+29
-ab -a-2b-2= -z-23
0 +a -b+0= 6 a-b= 6 a= b+6
reemplazando
ab+2a+b+2= z+29 ab=z
z+2a+b=z+27
2a+b=27 a= b+6
2(b+6)+b=27
2b+12+b= 27
3b= 15
b=5
2a+b=27
2a+5=27
2a=22
a=11
a+b=16