Question: (4,-5), m=-1/2? 

Answer: We know that the equation of a straight line is y=mx+c.Now as the straight passes through (4,-5) ,the value of x=4 and y=-5 would satisfy the equarion.Putting these values in the equation,w get -5=4(-1/2)+c or -5=-2+c => c=-7\nTherefore,the equation is y=-(1/2)x-7 [if you like you may multiply all the terms by 2 to make it 2y=-x-14]
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