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1. x+y=3 /*(-5)
5x+5y=15
-5x-5y=-15
----------------
0=0
2.x/5-y/4=4 /*20
3x+4y=-2
4x-5y=80 /*3
3x+4y=-2 /*(-4)
12x-15y=240
-12x-16y=8
-31y=248 /:(-31)
y=-8
3x=-2-4y
3x=-2+32
3x=30 /:3
x=10
3. 2x/3+4y/5=-2y /*15
4x/2-y/10=-2 /*10
10x+12y=-30y
20x-y=-20
10x+12y+30y=0
-y=-20x-20 /*(-1)
10x+42(20x+20)=0
y=20x+20
10x+840x+840=0
850x=-840 /:850
x=84/85
y=20*84/85+20
x=84/84
y=676/17
1 . x+y=3 /(-5)
5x+5y= 15
-5x-5y= -15
5x=5y=15
_______________
2zad. x/5-y/4=4 / x 20
4x-5y= 80 /*3
12x-15y =240
-12x-16y = 8
______________________
to jest poprawnie miałem to na lekcji
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1. x+y=3 /*(-5)
5x+5y=15
-5x-5y=-15
5x+5y=15
----------------
0=0
2.x/5-y/4=4 /*20
3x+4y=-2
4x-5y=80 /*3
3x+4y=-2 /*(-4)
12x-15y=240
-12x-16y=8
----------------
-31y=248 /:(-31)
y=-8
3x=-2-4y
3x=-2+32
3x=30 /:3
x=10
3. 2x/3+4y/5=-2y /*15
4x/2-y/10=-2 /*10
10x+12y=-30y
20x-y=-20
10x+12y+30y=0
-y=-20x-20 /*(-1)
10x+42(20x+20)=0
y=20x+20
10x+840x+840=0
y=20x+20
850x=-840 /:850
y=20x+20
x=84/85
y=20*84/85+20
x=84/84
y=676/17
1 . x+y=3 /(-5)
5x+5y= 15
-5x-5y= -15
5x=5y=15
_______________
0=0
2zad. x/5-y/4=4 / x 20
3x+4y=-2
4x-5y= 80 /*3
3x+4y=-2 /*(-4)
12x-15y =240
-12x-16y = 8
______________________
-31y=248 /:(-31)
y=-8
3x=-2-4y
3x=-2+32
3x=30 /:3
x=10
to jest poprawnie miałem to na lekcji