Rozwiąż układ równań metodą podstawiania:
a){x+y=7
x-y=7
b){2x-y=4
x+y=11
c){x-2y=-3
2x+3y=8
d){x+y=3
x-2y=6
e){x-y=5
3x+y=8
f){x+y=5
x-y=1
g){2x-y=4
-x+y=7
Dam naj !!!
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a)
{x+y=7
{x-y=7
{x=7-y
{7-y-y=7
{x=7-y
{2y=0
{x=7-y
{y=0
{x=7
{y=0
b)
{2x-y=4
{x+y=11
{y=2x-4
{x+2x-4=11
{y=2x-4
{3x=15
{y=2x-4
{x=5
{y=6
{x=5
c)
{x-2y=-3
{2x+3y=8
{x=-3+2y
{2(-3+2y)+3y=8
{x=-3+2y
{-6+4y+3y=8
{x=-3+2y
{7y=14
{x=-3+2y
{y=2
{x=1
{y=2
d)
{x+y=3
{x-2y=6
{x=3-y
{3-y-2y=6
{x=3-y
{3y=-3
{x=3-y
{y= -1
{x=4
{y= -1
e)
{x-y=5
{3x+y=8
{x=5+y
{3(5+y)+y=8
{x=5+y
{15+3y+y=8
{x=5+y
{4y=-7
{x=5+y
{y= - 1,75
{x=3,25
{y= -1,75
f)
{x+y=5
{x-y=1
{x=5-y
{5-y-y=1
{x=5-y
{2y=4
{x=5-y
{y=2
{x=3
{y=2
g)
{2x-y=4
{-x+y=7
{y=2x-4
{-x+2x-4=7
{y=2x-4
{x=11
{y=18
{x=11