Question 414529
First plot the points and draw a line through them like so



 {{{drawing( 500, 500, -10, 10, -6, 14,
 grid(1),
 graph( 500, 500, -10, 10, -6, 14,-x+7),
 circle(2,5,0.08),
 circle(2,5,0.10),
 circle(2,5,0.12),
 circle(-3,10,0.08),
 circle(-3,10,0.10),
 circle(-3,10,0.12)
 )}}}


Notice how you have to go down 5 units and then to the right 5 units to go from the left point to the right point. So the slope is {{{m=(-5)/5=-1}}}



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