Błagam o zrobienie tego, bo niestety będzie z tego ocena... (układy równań)
1. {y=12x
65=y+x
2. {x+y=54
x-9=9+y
3. {2x+3y=6,90
3x+2y=6,60
4. {x+y=28,80
x+25%*x=y-25%*y
5. {x+y=12
10x+y+54=10y=x
6. {2x+2y=28
x-1=y+1
7. {3%x+5%y=3,5%*2
x+y=2
Błagam, cokolwiek, bo niestety tego nie umiem;/
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1. y=12
65=12+x
x=65-12
x=53
x=53
y=12
1. {y=12x
65=y+x
y=12x
12+x=65
y=12x
13x=65/13
y=12x
x=0,2
y=12*0,2
x=0,2
y=2,4
x=0,2
2. {x+y=54
x-9=9+y
x=54-y
x=18+y
x=54-y
54-y=18+y
x=54-y
-y-y=18-54
x=54-y
-2y=-36/:|(-2)
x=54-y
y=18
x=54-18
y=18
x=36
y=18