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2x+4y=64
x=20-y
40-2y+4y=64
2y=24
y=12
x=8
Chodzilo 8 gesi
y-liczba gęsi
{x+y=20
{4x+2y=64
{x=20-y
{4(20-y)+2y=64
{x=20-y
{80-4y+2y=64
{x=20-y
{2y=16 /÷2
{x=20-y
{y=8
{x=20-8
{y=8
{x=12
{y=8
Odp. Po podwórku chodziło 8 gęsi.