Posted by **lee** on Tuesday, April 2, 2013 at 11:31am.

Can anyone help explain how to work this problem out?

One factor in flood safety along a levee is the area that will absorb water should the levee break. the coordinates that make up the boundry area are (0,0),(2.8,2.1)and(4.3,4.4) what is the area of the land that would absorb the water?

I believe its

a=]x1,y1,1_x2,y2,1_x3,y3,1]

=0,0,1_2.8,2.1,1_4.3,4.4,1]

area=1/2[det a]

then Im stuck

- algebra -
**Steve**, Tuesday, April 2, 2013 at 11:45am
what, you can't find the determinant?

Those two zeros in the top row make it easy:

|A| = (2.8)(4.4)-(4.3)(2.1) = 3.29

Better review your determinants if this technique is going to come up often.

- algebra -
**lee**, Tuesday, April 2, 2013 at 11:53am
Ok I see I was not multiplying the right numbers. Thanks for clarifying for me.

- algebra -
**samantha**, Monday, April 15, 2013 at 9:32pm
do you think you could help me with this quiz?

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