Plot the vertices, and you'll see that the triangle is a right triangle with one vertical side and one horizontal side.
Area of a triangle = (1/2) x height x base, so in this case,
Area = (1/2) x 5 x 4
Area = 10
So the formula for the area of a triangle is (b = base, h = height). In this case, by counting from (-3,-3) to (-3,2) the height is 5 and the base is 4 counting from (-3,2) to (1,2).
Using this info, we can form the equation and solve from there.
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