The equation of the line passing through the points $(-7, 8)$ and $(5, 2)$ is . . . . . . .

Find the equation of the line that bisects the line segment joining the points $(5, 3)$ and $(4, 4)$ and makes an angle of $45^{\circ}$ with the positive direction of the $x$-axis.

Find the equation of the line passing through the point $(2,2)$ and cutting off intercepts on the axes whose sum is $9$.

If the point $(5, 2)$ divides the segment of the line between the axes into two equal parts,then its equation is:

If the line $\frac{x}{a} + \frac{y}{b} = 1$ passes through the points $(2, -3)$ and $(4, -5)$,then $(a, b) = $

The equation of the straight line making equal intercepts on the axes and passing through the point $(2, 4)$ is