I don't see any "following points".
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Since there are no "following" points, none of them.
It has 2 solutions and they are x = 2 and y = 1 which are applicable to both equations
As Anand said, the question is vague. However, two important points for any equation are the x and y intercepts. For y = 2x, the x-intercept is (0,0) and the y-intercept is (0,0). Not sure if that helps.
This has infinite no. of solutions.
Equations can have many solutions. The equation of a straight line, for example, defines all points on the line. Even a simple equation such as x+y=5 can have a variety of solutions (x=1 when y=4, x=2 when y=3 and so on)