Question 157432
Find the x distance from R to S.
Find the y distance from R to S.
Divide both equally into thirds.
Find the coordinates using this x and y spacing.
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From P to Q, the total x change is,
{{{DELTA*x=8-2=6}}}
1/3 of the x change (x spacing) is, 
{{{(DELTA*x)/3=6/3=2}}}
From P to Q, the total y change is,
{{{DELTA*y=-9-3=-12}}}
1/3 of the y change (y spacing), 
{{{(DELTA*y)/3=-12/3=-4}}}
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Now start at P, find the coordinate of R using the x and y spacing,
R:(2,3)+(2,-4)=(4,-1)
Continue to the next point, S.
S:(4,-1)+(2,-4)=(6,-5)
You can verify that the next point is Q.
Q:(6,-5)+(2,-4)=(8,-9)
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{{{drawing( 300, 300, -4, 10, -10, 4,grid( 1 ),
circle( 2, 3, .2 ),
circle( 4, -1, .2 ),
circle( 6, -5, .2 ),
circle( 8, -9, .2 ),
green(line( 2, 3, 8, -9)))}}}