Solve the following system of linear equations graphically and find the vertices of the triangle formed by these lines and the x axis
x-y-1=0
x+1=0
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The intersection point is B (3,3)
The points of intersection of the two lines with x axis are:
A(-1,0) C(7,0). The altitude of the triangle ABC : BD = 3 units
Area of ΔABC = 1/2 * 8 * 3 = 12 units
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