Układy równań - metoda przeciwnych współczynników
a) {5x-7y=3 b) {4x-5y=5 c) {5x-y=7
{2x-3y=7 {6x-7y=9 {2(x+1)=2y
Prosze jak najszybciej
Kto pierwszy dam naj :P
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a)5x-7y=3/*2
2x-3y=7/*(-5)
10x-14y=6
-10x+15y=-35
10x-14y-10x+15y=-29
y=-29
2x-3y=7
2x-3*(-29)=7
2x=-80/:2
x=-40
b)4x-5y=5/*6
6x-7y=9/*(-4)
24x-30y=30
-24x+28y=-36
24x-30y-24x+28y=-6
-2y=-6/:(-2)
y=3
4x-5y=5
4x-5*3=5
4x-15=5
4x=20/:4
x=5
c)5x-y=7
2(x+1)=2y
5x-y=7
2x+2=2y
5x-y=7/*(-2)
2x-2y=-2
-10x+2y=-14
2x-2y=-2
-10x+2y+2x-2y=-16
-8x=16/:(-8)
x=-2
5x-y=7
5*(-2)-y=7
-10-y=7
-y=17/:(-1)
y=-17
licze na naj ;d