The slope of the line joining point P(-4, 7) and Q( 2, 3) is:

Find the equation of the line that passing through the point (7, -5 ) and is perpendicular to  the line (4x+5y=1).

The line passing through the point (-2,5) and  (6,b) is perpendicular to the line 20x + 5y = 3. Find b?

What is the equation of a line having slope -1/3 and y-intercept equal to 6? 

Find k, if the line 2x - 3y = 11 is perpendicular to the line 3x + ky = -4? 

What is the equation of line whose slope is -1/2 and passes through the intersection of the lines x-y = -1 and 3x-2y = 0?

The point P(a, b) is first reflected in origin to P1 and P1 is reflected in Y-axis to (4, -3). What are the coordinates of point P? 

The point Q(a, b ) is first reflected in y-axis to Q1 and Q1 is reflected in x-axis to (-5,3 ). The co-ordinates of point Q are