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y- kasztany Agnieszki
x=3y
x-15=y+15
x=3y
3y-y=30
x=3y
y=15
x=45
y=15
Jacek uzbieral 45 kasztanow a Agnieszka 15.
3x - kasztany Jacka
3x-15 - kasztany po oddaniu Jacka
x + 15 - kasztany po oddaniu Agnieszki
3x - 15 = x + 15
3x - x = 15 + 15
2x = 30
x = 15
3 * 15 = 45
Odp: Agnieszka ma 15 kasztanów , a Jacek ma 45.
x-15=y+15
x-3y=0/x (-1)
x-y=30
-x+3y=0
x-y=30
2y=30
y=15
x=3x15
x=45