Calculate the distance OP, where O is origin and $P=\left(3,4\right)$.

 In the given figure, a straight line passes through the points $P\left(-1,4\right)$ and $Q\left(5,-2\right)$. It intersects the coordinate axes at points $A$ and $B$. If $M$ is the midpoint of the segment $AB,$ then find the equation of the line.

 In the given figure, a straight line passes through the points $P\left(-1,4\right)$ and $Q\left(5,-2\right)$. It intersects the coordinate axes at points$A$ and $B$. If $M$ is the midpoint of the segment $AB$, then find the coordinates of $A$ and $B$.

 In the given figure, a straight line passes through the points $P\left(-1,4\right)$ and $Q\left(5,-2\right)$. It intersects the coordinate axes at points $A$and $B$. If $M$ is the mid-point of the segment $AB$, then find the coordinates of $M$ .