The slope of the line joining coordinate points (6,-1) and (8,7):
Net
Select one:
a. a
b. 7
CON
c.4
d.-4
Check
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answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}