Question

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Answer 1

a)

2x-y=5

3x-y=10 (.-1)

_____________

2x-y=5

-3x+y=-10

-x=-5 (.-1)

x=5

_____________

2.5-y=5

10-y=5

-y=5-10

-y=-5 (.-1)

y=5

S=(5;5)

b)

5x-y=7

2x+y=7

_____________  

5x+2x-y+y=7+7

7x=14

x=14/7

x=2

_____________  

2•(2)+y=7

4+y=7

y=7-4

y=3

S=(2;3)

c)

x-2y=6

x-2=2 (.-1)

_____________

x-2y=6

-x+2=-2

2-2y=4

-2y=4-2

-2y=2 (.-1)

2y=-2

y= -2/2

y= -1

_____________

x-2.(-1)=6

x+2=6

x=6-2

x=4    

S=(4;(-1))