1.Rozwiąż układ równań metodą podstawiania
a) {x-y+2=0
{2y=x+6
b) {2y-5x=6
{-x=-y+6
c) {2x-5(y+1)=-5
{-x+2(y+2)=4
d) {2y-(3+y)=0
{-x+y/2=2
e) {3x+y=4
{6x-(1-2y)=7
f) {1/6x+3y=-20
{1/3x-2y=16
g) {pierwiastek z 2x+y=3
{2y-pierwiastek z 3x =6
a)
x-y+2=0
2y=x+6
x= y-2
2y= x+6
x=y-2
2y= y-2+6
x=y-2
2y-y= -2+6
x=y-2
y= 4
y=4
x-y+2=0
y=4 spr. y=4, x=2, x-y+2=0 --> 2-4+2=0
x-4+2=0
y=4
x=4-2
y=4
x=2
b)
2y-5x=6
-x=-y+6 / *(-1)
2y-5x=6
x=y-6
x=y-6
2y-5*(y-6)=6
x=y-6
2y-5y+30=6
x=y-6
-3y=6-30
x=y-6
-3y= -24 / :(-3)
x=y-6
y=8
y=8
2y-5x=6
y=8 spr. y=8, x=2, 2y-5x=6 --> 2*8-5*2=6 16-10=6
2*8-5x=6
y=8
16-6=5x
y=8
10=5x / :5
y=8
x=2