Question

Rezolva prin metoda reducerii :​

Answer 1

f)

-2x+3y=1 | ×3

3x-4y=-1 | ×2

-6x+9y=3

6x-8y=-2

y=1

-2x+3=1

-2x=-2

x=1

g)

x-2y=-5

3x+y=6 | ×2

x-2y=-5

6x+2y=12

7x=7

x=1

1-2y=-5

-2y=-6

y=3

h)

7x-6y=19

x-2y=5 | ×(-3)

7x-6y=19

-3x+6y=-15

4x=4

x=1

1-2y=5

-2y=4

y=-2