Odpowiedzi

2010-02-23T15:24:53+01:00
2x+2y=36
3x-3y=36

2x = 36 - 2y |:2
x = 18 -y
3( 18 -y) -3y=36
54 -3y -3y=36
-6y = - 18 |:-6
y = 3

x =18-3 = 15
x=15
y=3
2010-02-23T15:25:47+01:00
2x+2y=36/:2
3x-3y=36/:3

x+y=18
x-y=12

x=18-y
18-y-y=12

-2y=12-18
-2y=-6
y=6:2
y=3

x=18-3=15

odp. x=15
y=3

spr. 2×15+2×3=36
30+6=36
36=36

3×15-3×3=36
45-9=36
36=36