book Maths Puzzle Numerical Ability

how do you do 3/2 x/-27 and 9=t-8/4

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I need help figuring 2x + 3y = 6 (for x) Find the area of the following figures using determinants

The points on the graph are (-2,1) (2,3) (-1,-4) (3,0)

What I have so far
D=1/2 det [a1 a2 a3
b1 b2 b3