How can you use the slope of a line to tell whether it is increasing or decreasing over all reals?

Elementary Algebra
17th Edition
ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
Publisher:Lynn Marecek, MaryAnne Anthony-Smith
Chapter4: Graphs
Section4.5: Use The Slope–intercept Form Of An Equation Of A Line
Problem 4.105TI: Use slopes and y-intercepts to determine if the lines x=1 and x=5 are parallel.
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How can you use the slope of a line to tell whether it is increasing or decreasing over all reals?

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