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2x+7y=76
x+y=18
2m + 7p = 76
m+p = 18
p=18-m
2m+7p=76
7p=76-2m
p=(76-2m)/7
18-m=(76-2m)/7
18-m=(76/7)-(2m/7)
(2m/7)-m=(76/7)-18
(2m/7)-(7m/7)=(76/7)-((18*7)/7)
(2m-7m)/7=(76-126)/7
-5m=((-50)7)*7
m=-50/5=10
m+p=18
p=18-10=8
Resultado:
10 manzanas y 8 peras.
Comprobacion:
2m+7p=76
2(10)+7(8)=76
20+56=76
76=76