przykład a i b zadanie 286
a) {2x+5y=6 {2x+5y=6
x+3y=7
x+3y=7 /*(-2) {2x+5*8=6
{2x+5y=6 x+3*8=7
-2x-6y=-14 {2x+40=6
-y=-8/(-1) x+24=7
y= 8 { 2x=6-40
------------------------------/
b) { x-2y=6 / x=7-24
x+1= 2(3-y) / 2x=-34
{x-2y=6 / x=-17
x+1=6-2y / 3x= -51/3 /
{x-2y=6 / x= -17 /
x+2y=6-1 /////////////////////
{x-2y=6
x+2y=5
----------------
2x=11/2
x=5,5
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a) {2x+5y=6 {2x+5y=6
x+3y=7
x+3y=7 /*(-2) {2x+5*8=6
{2x+5y=6 x+3*8=7
-2x-6y=-14 {2x+40=6
-y=-8/(-1) x+24=7
y= 8 { 2x=6-40
------------------------------/
b) { x-2y=6 / x=7-24
x+1= 2(3-y) / 2x=-34
{x-2y=6 / x=-17
x+1=6-2y / 3x= -51/3 /
{x-2y=6 / x= -17 /
x+2y=6-1 /////////////////////
{x-2y=6
x+2y=5
----------------
2x=11/2
x=5,5