Question

If xy+x+y+1=0,x+ay-3=0 are concurrent,then a=?

Answer 1

https://www.desmos.com/calculator/5zqq4gg9ck

Answer 2

strange equation !
xy+x+y+1=0

if we factor it this way:
x(y+1) + (y+1) = 0
(x+1)(y+1) = 0
we get either
x+1=0 or y+1=0
x=-1, or y=-1

this looks like two lines that intersect at -1,-1

Answer 3

I think it needs 3 lines to be concurrent?

Answer 4

so I think they want to know what "a" makes
x+ay-3=0
go through the point -1,-1

Answer 5

?
-1+a(-1) - 3 =0
a= -4

Answer 6

i think there are a lot of 'a' make xy+x+y+1=0,x+ay-3=0 concurrent ;