C)
{-x-y=-6 | +
{-x+y=2 |
_________
-2x=-4 |: (-2)
x=2
{x=2
{-2-y=-6
{x=2
{-y=-4 |x(-1)
{x=2
{y=4
d)
{4x-5y=-4 |*3
{-2x+3y=1,1 |*5
{12x - 15y=-12 | +
{-10x + 15y=5,5 |
_______________
2x=-6,5 |:2
x=-3,25
{x=-3,25
{4 * (-3,25) - 5y = -4
{x=-3,25
{-13-5y=-4
{x=-3,25
{-5y=9 |:(-5)
{x=-3,25
{y=-1,8
e)
{-2x+y=0 |*3
{3x-3y=1
{-6x+3y=0 | +
{3x-3y=1 |
__________
-3x=1 |:(-3)
x= - 1/3
{x=- 1/3
{-1-3y=1
{x=-1/3
{-3y=2 | :(-3)
{x=-1/3
{y=-2/3
f)
{3x-2y=0 | * (-5)
{2x-5y=-19 | *2
{-15x+10y=0 | +
{4x-10y=-38 |
_____________
-11x=-38 |:(-11)
x=3 5/11
{x=3 5/11
{2 * 38/11 - 5y=-19
{x=3 5/11
{76/11 - 5y = -19
{x= 3 5/11
{6 10/11 + 19 = 5y
{x=3 5/11
{25 10/11 = 5y |:5
{x=3 5/11
{285/11 :5=y
{x= 3 5/11
{5 2/11= y
g)
{-4+1,2y=-1 |*5
{5x-6y=1,25
{-20+6y=-5 | +
{5x-6y=1,25|
___________
-20+5x=-3,75
5x=16,25 |:5
x=3,25
{x=3,25
{-20+6y=-5
{x=3,25
{6y=15 |:6
{x=3,25
{y=2,5
h)
{3x+6(y-2)=0
{x+3y-4=0 |* (-3)
{3x+6y-12=0 | +
{-3x-9y=0 |
____________
-3y=12 |:(-3)
y=-4
{y=-4
{-3x +36=0
{y=-4
{-3x=-36 |:(-3)
{y=-4
{x=12
;];];]