Question

rozwiosz uklad rownan dowolnom metodom [x-2y=-14 [2x-y=-10 b] [x-5y=-2 [2x plus y=-4 c] [x plus 2y=9 [4x-2y=-4 d] [4x plus 3y=10 [3x plus 4y=11

Answer 1

a)

x-2y=-14

2x-y=-10/ *(-2)

 

x-2y=-14

-4x+2y=20

 

-3x=6/:(-3)

x=-2

 

-2-2y=-14

-2y=-14+2

-2y=-12/:(-2)

y=6

 

x=-2

y=6

 

 

b)

x-5y=-2/*(-2)

2x+y=-4

 

-2x+10y=4

2x+y=-4

11y=0

y=0

 

2x+0=-4

2x=-4/:2

 

x=-2

y=0

 

c)

x+2y=9

4x-2y=-4

 

5x=5/:5

x=1

 

1+2y=9

2y=8/:2

y=4

 

x=1

y=4

 

 

d) 

4x+3y=10/*(-4)

3x+4y=11/*3

 

-16x-12y=-40

9x+12y=33

 

-7x=-7/:(-7)

x=1

 

3+4y=11

4y=8/:4

y=2

 

x=1

y=2