For all real values of a and b, line(2a+...

For all real values of a and b, line`(2a+b)x+(a+3b)y+(b-3a)=0 and mx+2y +6=0 " are concurrent. The " absm` is equal to

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For all values of the a and b the lie (a+2b)x+(a-b)y+(a+5b)=0 passes through the point

`(-1,2)`

`(2,-1)`

`(-2,1)`

`(1,-2)`

`-7`

`-20`

`-1`