a) -3x+y=2 / *8
2x-8y=6
-24x + 8y = 16
2x - 8y= 6
(8y i -8y się skracają)
-22x = 22 /: (-1)
x = -1
-3x +y =2
-3(-1) +y = 2
3 + y = 2
y = 2-3
y = -1
b)5(x-2)+y=3
y-2=1-5x
5x-10+y=3
y-2=1-5x
5x-10+y=3
y-2+5x=1
5x+y =10+3
y+5x=1+2
5x+y=13
y+5x = 3 / *(-1)
5x+y=13
-y-5x = -3
0 ≠ 10 równanie błędne.
