Which system of equations has only one solution?

4x+2y = 8

-4x-2y=3

-5x+y=6

5x-y=-6

-3x+4y = 2

3x-4y=0

2x+4y = 6

3x-47-9

fourth group of equation has one only one solution

Step-by-step explanation:

when we solve these

4x+2y = 8

-4x-2y=3

we get infinite solution

-5x+y=6

5x-y=-6

we get infinite solution

-3x+4y = 2

3x-4y=0

but when we solve forth equation we get

2x+4y = 6

3x-4y=-9

5x=15

x=3

only one solution