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Uncaught TypeError : Cannot Read Properties of Undefined

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Undefined and Zero Slope from Graph

SOLVED: For each line, determine whether the slope is positive, negative, zero, or undefined. Line 1 Line 2 Line 3 Line 4 Positive Negative Zero Undefined Positive Negative Zero Undefined Positive Negative

Undefined Slope

What is the Difference Between Null and Undefined in JavaScript?, by Sumit kumar Singh