Question 24

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Jambmaths question: 

If the lines $2y-kx+2=0$and $y+x-\tfrac{k}{2}=0$intersect at (1, – 2). Find the value of k

Option A: 

– 1

Option B: 

– 2

Option C: 

– 3

Option D: 

– 4

Jamb Maths Solution: 

Substitute the value (x, y) = (1, –2) into any of the equation to obtain the value of k

Using $2y-kx+2=0$, substituting x =1 and y = – 2 respectively into the equation

$2(-2)-k(1)+2=0,\text{ }k=-2$

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