Answer
not a constant
Work Step by Step
$\frac{12-6}{2-1}$=6
$\frac{15-13}{3-2}$=2
6$\ne$2
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 5 - Linear Functions - 5-1 Rate of Change and Slope - Practice and Problem-Solving Exercises - Page 296: 8
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