3x-4y=4
5y-x=9
Rozwiąż metodą przeciwnych współczynników
+_____________
3x - 4y = 4 /*5
-x + 5y = 9 /*4
15x - 20y = 20
-4x + 20y = 36
11x = 56 /:11
x = 56/11
x = 5 1/11
-x + 5y = 9
- 5 1/11 + 5y =9
5y = 9 + 5 1/11
5y = 14 1/11
5y = 155/11 /*(1/5)
y=31/11
y=2 9/11
x= 5 1/11
y= 2 9/11
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+_____________
3x - 4y = 4 /*5
-x + 5y = 9 /*4
15x - 20y = 20
-4x + 20y = 36
11x = 56 /:11
x = 56/11
x = 5 1/11
-x + 5y = 9
- 5 1/11 + 5y =9
5y = 9 + 5 1/11
5y = 14 1/11
5y = 155/11 /*(1/5)
y=31/11
y=2 9/11
x= 5 1/11
y= 2 9/11