PILNE! :D
a) 5x+2y=3 -
4y+6=10x
b) x+y=5
2x+2 (y-4)=4
c) 5x-2y=8
10y-4x=16
d) x+y = 5
2x+y=10
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a)
5x+2y=3
4y+6=10x
5x+2y=3 /*2
-10x+4y=-6
10x+4y=6
-10x+4y=-6
----------------------
8y=0 /:8
y=0
5x+2*0=3
5x=3 /:5
x=3/5
b)
x+y=5
2x+2(y-4)=4
x+y=5
2x+2y-8=4
x+y=5
2x+2y=4+8
x=5-y
2x+2y=12
2(5-y)+2y=12
10-2y+2y=12
-2y+2y=12-10
0=2 sprzeczne
c)
5x-2y=8 /*4
10y-4x=16 /*5
20x-8y=32
-20x+50y=80
---------------------
42y=112 /:42
y=2i2/3
5x-2*8/3=8
5x-16/3=8
5x=8+5i1/3
5x=13i1/3 /:5
x=40/3*1/5
x=40/15
x=2i2/3
d)
x+y=5 /*(-2)
2x+y=10
-2x-2y= -10
2x +y= 10
----------------------
-y=0
y=0
x+0=5
x=5-0
x=5