x-2y=4 -x+3y=0

x-2y=4 -x+3y=0 ---------- y=4 x-2y=4 y=4 x-8=4 x=12 x=12 y=4

x=4+2y podsawiamy do drugiego -(4+2y)+3y=0 -4-2y+3y=0 y=4 x=4+2*4 x=12

x-2y=4 -x+3y=0 _________ - y=4 x- 2*4 = 4 +8 -x+3*4 = 0 * (-1) x= 12 y = 4 Sprawdzam drugie równanie: -12+3*4 = 0 -12 + 12 = 0 L=P