If $y$-coordinate of a point is zero,then this point always lies

Write the coordinates of the points marked on the axes in the figure.

If $(x+2, 7)$ and $(2x-1, 7)$ are the same point,then $x = $ ...........

If the point $(a, 0)$ is on the ray $OX^{\prime}$,is $a$ a positive number or a negative number?

See the figure and complete the following statements:
$(i)$ The abscissa and the ordinate of the point $B$ are ......... and ......... respectively. Hence,the coordinates of $B$ are (.........,.........)
$(ii)$ The $x$-coordinate and the $y$-coordinate of the point $M$ are ......... and ......... respectively. Hence,the coordinates of $M$ are (.........,.........)
$(iii)$ The $x$-coordinate and the $y$-coordinate of the point $L$ are ......... and ......... respectively. Hence,the coordinates of $L$ are (.........,.........)
$(iv)$ The $x$-coordinate and the $y$-coordinate of the point $S$ are ......... and ......... respectively. Hence,the coordinates of $S$ are (.........,.........)

Signs of the abscissa and ordinate of a point in the second quadrant are respectively