Question

Prosze o rozwiazanie zadania 4 jeszcze dzis :]

Answer 1

4y-3x=-4 /2

2x+3y=14 /*3

 

8y-6x=-8

6x+9y=42

17y=34

y=2

-3x=-4-8

x=4

2.

5x+4y=-15

5x-y=20 /*-1

 

5x+4y=-15

-5x+y=-20

5y=-35 y=-7

5x=20-7

5x=13

x=13/5

3.

4x-5y=80/*3

3x+4y=-2/*-4

 

12x-15y=240

-12x-16y=8

-31y=248

y=-8

3x=-2+32

3x=30 x=10

4/

2/3y+3/4x=y+5x/*12

1/2y-2/3x=3y-2x

4y+45x=0/15

15y-8x=0/-4

60y+675x=0

-60y+32x=0

707x=0

y=0