In a given linear equation, the value of the independent variable
decreases at a constant rate while the value of the dependent
variable increases at a constant rate. the slope of this line is
(1) positive (3) zero
(2) negative (4) undefined

(2) Negative

Independent variable is on horizontal line (call is X)
Dependent variable is on vertical line (call it Y)
As X increases (moves to the right), Y decreases (moves down).
From mathematical point of view, slope is rise/run. Rise is negative, run is positive. Divide negative number by positive, you get negative.

Hopefully that will make sense :)

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