1.x=2 solution: X=3 is parallel to the y axis, so the straight line passing through point (2, 1) is also parallel to the y axis, so x=2!

2.N= 1 1/3 solution; Given the slope of a straight line = 1/2, we can get (6-n)/(n+ 1)= 1/2 from the parallel slopes of two straight lines, and we can get the solution of n =1/3.

I hope I can help you!