Best explained and correct answer gets

Given two points (x₁,y₁) and (x₂,y₂) the slope of the line that passes through these points is.
m=(y₂-y₁) / (x₂-x₁)

Data:
we choose two points, for explample:
(0,0)
(6,-1)

m=(-1-0)/(6-0)=-1/6

C) -1/6

The Answer is C, because the Y axis is at 0 then you move down (-1) and go to the right (6) and you can see that the line passes through point (6,-1). so your slope is -1/6

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C. expression because any expression or equation may contain more than one variable