Odpowiedź:
Szczegółowe wyjaśnienie:
a) x - y = 0 to x = y
5y - y = 4
4y = 4 /:4
y = 1 to x = 1
b) x + 3y = 3 to x = 3 - 3y
(3 - 3y) - 2y = -2
- 3y - 2y = -2 - 3
- 5y = -5 /:(-5)
y = 1 to x = 3 - 3 = 0
c) 7x - 2y = 200
3x + y = 550 to y = 550 -3x
7x -2(550 -3x) = 200
7x + 6x = 200 + 1100
13x = 1300 /:13
x = 100 to y = 550 -3 razy 100 =550 - 300 = 250
