DAM NAJJJ
Rozwiąż układy równań metodą podstawiania!!!!!
1.
{x+y=3
{x-2y=6
2.
{x-y=5
{3x+4y=8
3.
{x+y=5
{x-y=1
4.
{2x+y=14
{5x+4y=17
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{x+y=3 --->x=3-y
{x-2y=6
3-y-2y=6 -3y=3 y= -1
x=3--1 x= 4
{x-y=5 x=5+y
{3x+4y=8 3* (5+y) + 4y=8 15+3y+4y=8 7y= -7 y =-1
x= 5+-1 x=4
{x+y=5 x=5-y
{x-y=1
5-y -y =1 -2y=-4 y=2
x=5-2 x=3
{2x+y=14 2x=14-y x=14-y/2
{5x+4y=17
5*(14-y/2)+4y=17 70-5y/2 +4y=17 -2,5y+4y=17-35 1,5y=18 y=12
x=14-12/2 2/2 x=1