1. Find the slope of the line joining the points (2,3) and (4, -5).

2. Find the slope of the line 2x-3y+7= 0.

3. Find the equation of the straight line making an angle of 135° with the positive direction of x-axis and cutting an intercept of 5 on the y-axis.

4. Find the equation of the straight line cutting off intercepts 2 and -5 on the axes.

5. Find the equation of the straight line passing through the points (7, -3) and cutting off equal intercepts on the axes.