First slide
Equation of line in Straight lines
Question

 The range of value of α such that (0,α) lies on or inside  the triangle formed by the lines y+3x+2=0,3y2x5=0,4y+x14=0 is 

Moderate
Solution

Point (0, α) lies on they-axis. In such questions, it is easier to see the location of point if lines are drawn on the axis.

 From the diagram, it is clear that 53α72

 


 

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