11.
The graph of the equation x - 7y = -72, intersects the y-axis at P(α, β) and the graph of 6x + y - 15 = 0, intersects the x-axis at Q(γ, δ). What is the value of α + β + γ + δ?

12.
What is the slope of the line parallel to the line passing through the points (5, -1) and (4, -4)?

13.
Find the area of quadrilateral formed by joining points (4, 2), (8, 2), (8, 14) and (4, 10).

14.
What is the slope of the line, parallel to the line 3x - 6y = 4?

15.
What is the area (in unit squares) of the triangle enclosed by the graphs of 2x + 5y = 12, x + y = 3 and the x-axis?

16.
If the ordinate and abscissa of the point (k, 2k - 1) be equal, then the value of k is:

17.
Reflection of the point (4, -6) in the origin is:

18.
Find the equation of a circle whose diameter has end points (4, 3) and (-2, 1).

19.
The graph of the equations 5x - 2y + 1 = 0 and 4y - 3x + 5 = 0, intersect at the point P(α, β). What is the value of (2α - 3β)?

20.
Area of the triangle formed by the graph of the straight lines x - y = 0, x + y = 2 and the x-axis is: