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    So as you can see I've got as far as working the equation of the line that's perpendicular but how I do now work out the area?Name:  image.jpg
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Size:  498.3 KB I guessed it would be 0.5 multiplied by something since it's a triangle- I don't know please help
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    (Original post by Lucofthewoods)
    So as you can see I've got as far as working the equation of the line that's perpendicular but how I do now work out the area? I guessed it would be 0.5 multiplied by something since it's a triangle- I don't know please help
    Diagram may help you to see what's going on.

    OK, you've got the line y=-2x+9 ...(1), and you want the area of the triangle OAB.

    So, you need to know where A and B are. In your answer you've labelled the two given points at A and B, but that's not the case.

    A is the point where your new line meets the x axis. So, sub y=0 into your equation (1) and solve for x, and this will be the length of OA.

    Can you now find B and complete it?
 
 
 
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