Odpowiedź :
1.
9x+y=33 / - 9x
5x-2y=26
y=33 - 9x
5x - 2y= 26
y=33-9x
5x - 2(33-9x)=26
y=33-9x
5x - 66+ 18x=26
y=33-9x
-13x = 26+66
y=33-9x
-13x=91 / : (-13)
y=33-9x
x = 7
y = 33 - 9*7
x=7
y= 33 - 63
x=7
y = -30
x=7
2.
9x+y=33 / - 9x
5x-2y=26
y=33 - 9x
5x - 2y= 26
y=33-9x
5x - 2(33-9x)=26
y=33-9x
5x - 66+ 18x=26
y=33-9x
-13x = 26+66
y=33-9x
-13x=91 / : (-13)
y=33-9x
x = 7
y = 33 - 9*7
x=7
y= 33 - 63
x=7
y = -30
x=7
2.
zad.1
9x+y=33
5x-2y=26
y=33-9x
5x-2(33-9x)=26
y=33-9x
5x-66+18x=26
y=33-9x
23x=26+66 /:23
y=33-9x
x=4
y=-3
x=4
zad.3
6x+7y=3
2x+5y=1
6x+7y=3
2x=1-5y /:2
6x+7y=3
x=0,5-2,5y
6(0,5-2,5y) +7y=3
x=0,5-2,5y
2-15y+7y=3
x=0,5-2,5y
-8y=3-2 /:(-8)
x=0,5-2,5y
y=-0,125
x=0,5-2,5*(-0,125)
y=-0,125
x=O,1875 ?
zad.4
2x+2/3y=44
3x-5/6y=33
2x=44-2/3y /:2
3x-5/6y=33
x=22-3y
3(22-3y)-5/6y=33
x=22-3y
66-9y-5/6y=33
x=22-3y
-59/6y=33-66 /:-59/6
x=22-3y
y=... ?
9x+y=33
5x-2y=26
y=33-9x
5x-2(33-9x)=26
y=33-9x
5x-66+18x=26
y=33-9x
23x=26+66 /:23
y=33-9x
x=4
y=-3
x=4
zad.3
6x+7y=3
2x+5y=1
6x+7y=3
2x=1-5y /:2
6x+7y=3
x=0,5-2,5y
6(0,5-2,5y) +7y=3
x=0,5-2,5y
2-15y+7y=3
x=0,5-2,5y
-8y=3-2 /:(-8)
x=0,5-2,5y
y=-0,125
x=0,5-2,5*(-0,125)
y=-0,125
x=O,1875 ?
zad.4
2x+2/3y=44
3x-5/6y=33
2x=44-2/3y /:2
3x-5/6y=33
x=22-3y
3(22-3y)-5/6y=33
x=22-3y
66-9y-5/6y=33
x=22-3y
-59/6y=33-66 /:-59/6
x=22-3y
y=... ?