Which statement is not true about the slope of a straight-line graph?
a) slope is a measure of the steepness of the line
b) slope is the ratio of vertical change to horizontal change
c) slope is zero if the line is horizontal
d) slope is 1 if the line is vertical

Option D. Slope is 1 if the line is vertical

Step-by-step explanation:

we have

Part A)  Slope is a measure of the steepness of the line

The statement is true

Because, the steepness of a line is measured by the absolute value of the slope.

Part B) Slope is the ratio of vertical change to horizontal change

The statement is true

Because the formula to calculate the slope between two points is equal to

so

Is the ratio of vertical change to horizontal change

Part C) Slope is zero if the line is horizontal

The statement is true

Because If the line is horizontal, the y-coordinate of two points is the same

therefore

The vertical change is equal to zero

Part D) Slope is 1 if the line is vertical

The statement is Not true

Because, if the line is vertical the slope is undefined

391.6 is the correct answer

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