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The gradient, m, is the change in the y coordinates over the change in the x coordinates. M=(y₂ - y₁) / ( x₂ - x₁)

(2x-5)/(x+5)

Factorise 2x²-4x-6=0

2(x²-2-3)=0   ->    2(x+1)(x-3)=0

split factors up       2=0 ,  (x+1)=0   and   (x-3)=0     

                                x+1=0  ->...