exam Maths Puzzle Numerical Ability

Hi May I have some help solving this problem?

Plot the points A(0, 0), B(3, 0), C(2, 9), and D(1, 9) on a coordinate plane. Draw the segments AB, BC, CD, and DA. What is its area?

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exam Other Question

determine the correct half-plane in each case and complete the graph
4x+y>4 (the symbol > has an underline) For what value of k does the equality hold

|1 0 4 | |1 0 4|
|3 0 9 |=k|3 0 9|?
|5 5 20| |5 5 20|

a. -1
b. 0
c. 1
d. 2