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b: precio de peras
2a+3b=7.80 ......(A)
5a+4b=13.2......(B)
Multiplicamos (A)x5 y (B)x2 tenemos:
10a+15b=39.00 .......(A)x5
10a+8b=26.40 ..........(B)x2
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restando (A)x5 - (B)x2
7b=39.00-26.40-------> 7b=12.60 ...b=12.60/7 => b=1.80
Reemplazando en (A) tenemos 2a+3x1.80=7.80=>2a=7.80-5.40=>2a=2.40=>a=1.20