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# Co ordinate geometry watch

1. Line l with equation x-2y+2=0 crosses the y axis at point p the line m with equation 3x+y-15=0 crosses the y axis at the point q and intersects line l at the point R find the area of triangle PQR.

How would someone approach this question?What methods and steps should someone use?
2. (Original post by Anonymous1502)
Line l with equation x-2y+2=0 crosses the y axis at point p the line m with equation 3x+y-15=0 crosses the y axis at the point q and intersects line l at the point R find the area of triangle PQR.

How would someone approach this question?What methods and steps should someone use?

Find the points P, Q, and R.

Different ways to get the area. You can find the exact angle between L and the y-axis then do 1/2absin(C). Or you can use Heron's formula since you can work out all 3 side lengths. Or you can split PQR into two triangles by dropping a line from R to the y-axis - this gives two right-angled trangles.

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Updated: October 14, 2017
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