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4(x + y) - 4 = 7(x - y)
2x + 2y = 3x - 3y + 4
4x + 4y - 4 = 7x - 7y
2x - 3x + 2y + 3y = 4
4x - 7x + 4y + 7y = 4
- x + 5y = 4 / * - 3
- 3x + 11y = 4
3x - 15y = - 12
- 3x + 11y = 4
dodajemy stronami
3x - 3x - 15y + 11y = 4 - 12
- 4y = - 8
y = - 8/- 4 = 2
- x + 5y = 4
- x + 5 * 2 = 4
- x + 10 = 4
- x = 4 - 10
- x = - 6
x = 6
odp
x = 6
y = 2