Answer: x = -3, x=+/2=1.4142
The equation for these lines to pass through the points are; y= 3/2x -3
we can see that
Z , L and S are three points of line ZS
so, Z , L and S are collinear
and
Z , L and S lie on plane M
so, they are coplanar
so, option-C....................Answer
Yes it is because you are saving $30 if the trip is $10 each way