Question

line. it is also known as the
░░░░░░░░░░░░░░░ rate of change.
if a line is slanting upwards
we say it has a ░░░░░░░░░░░░░░░
slope. if a line is slanting
downwards we say it has a
░░░░░░░░░░░░░░░ slope. a slope of
zero means the line is
░░░░░░░░░░░░░░░. an undefined
slope means the line is
░░░░░░░░░░░░░░░. all straight line
graphs are known as

Explanation:

Step1: Recall slope definitions

The slope of a line is the rate of change. So the first blank is "slope".

Step2: Positive slope direction

A line slanting upwards has a positive slope. So the second blank is "positive".

Step3: Negative slope direction

A line slanting downwards has a negative slope. So the third blank is "negative".

Step4: Slope of zero line

A slope of zero means the line is horizontal (parallel to the x - axis). So the fourth blank is "horizontal".

Step5: Undefined slope line

An undefined slope means the line is vertical (parallel to the y - axis). So the fifth blank is "vertical".

Answer:

First blank: slope; Second blank: positive; Third blank: negative; Fourth blank: horizontal; Fifth blank: vertical