A farmer has some pigs and some ducks.There are 9 heads and
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A farmer has some pigs and some ducks.There are 9 heads and 26 feet.how many pigs are there?
![A farmer has some pigs and some ducks.There are 9 heads and](/uploads/image/z/7454109-21-9.jpg?t=A+farmer+has+some+pigs+and+some+ducks.There+are+9+heads+and)
猪x 鸭y
x+y=9
4x+2y=26
x=4
y=5
x+y=9
4x+2y=26
x=4
y=5
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