What is the slope of the line through points (1,9) and (1,-5)?

1 Answer
Don't Memorise
May 6, 2016

The pair of points have no slope.

Explanation:

(1 , 9) = color(blue)(x_1 , y_1)(1,9)=x1,y1

(1 , -5) = color(blue)(x_2 , y_2)(1,−5)=x2,y2

Slope is calculated using formula:
Slope = color(blue)((y_2 - y_1)/ (x_2 - x_1)=y2−y1x2−x1 (change in yy axis divided by change in xx axis)

= (-5-9) /( 1-1)=−5−91−1

= (-14) /( 0) = =−140= not defined.

The pair of points have no slope.

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