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Answer:

5.x=-2,y=-2

7. y=1 , x=-1  

Step-by-step explanation:

5. x+y=-4 equation 1

    x-y=2   equation 2

x=-2

Equation 1, x=-2

-2+y=-4

y=-2

7.

-3x-4y=-1   equation 1

3x-y=-4     equation 2

-5y=-5

y=1

Equation-1 ,y=1

-3x-4=-1

-3x=3

x=-1

Answer:

5. x+y=-4

   x=-4-y

-4-y-y=2

-2y=6

y=-3

x-3=-4

x=1

7. (1)+(2), -3x-4y+3x-y=-1-4

                             -5y=-5

                                y=1

           3x-1=-4

               x=-1

   

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