dwa borsuki ważą tyle samo co trzy lisy, a dwa lisy wazą o 5 kg więcej od jednego borsuka. ilewazy borsuk??
borsuk - x
lis - y
2x = 3y
2y = x+5
2x-3y = 0 |*2
x-2y = -5 |*(-3)
4x-6y = 0
-3x+6y = 15
----------------------
4x-3x = 15
x = 15
15-2y = -5
2y = 20 |:2
y = 10
borsuk - 15kg
lis - 10kg
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borsuk - x
lis - y
2x = 3y
2y = x+5
2x-3y = 0 |*2
x-2y = -5 |*(-3)
4x-6y = 0
-3x+6y = 15
----------------------
4x-3x = 15
x = 15
x = 15
15-2y = -5
x = 15
2y = 20 |:2
x = 15
y = 10
borsuk - 15kg
lis - 10kg