Odpowiedzi

2010-03-21T12:19:40+01:00
5(2x+3)-2(3y-4)=3
(3x+2)/4-(y-3)/2=5 |*4

10x+15-6y+8=3
2x+2-2y+6=20

10x-6y=-20
2x-2y=12 |*-3

10x-6y=-20
-6x+6y=-36
------------
4x=-56
x=-14

10*(-14)-6y=-20
-140-6y=-20
-6y=-20+140
-6y=120
y=-20
2010-03-21T12:22:00+01:00
A )
5x = 7 * (6x +26) + 3
5x = 42x + 182 + 3
5x = 42 x + 185
5x - 42x = 185
-37x = 185 | :(-37)
{x = -5
{ y = 6 * (-5)+ 26
{x = -5
{y = -30 + 26
{ x = -5
{y = -4
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