Question

cross method solve
3x+4y=-6
3x-y=9​

Answer 1

Answer:

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Answer 2

Answer:

3x+4y=-6. *1

3x-y=9. *4

3x+4y=-6

12x-4y=36

15x=30

x=30/15

x=2

subtitute x=2 in equ 1

3(2)+4y=-6

6+4y=-6

4y=-6-6

4y=-12

y=-12/4

y=-3

x=2,y=3