Question 899835
First find the x distance and the y distance between the endpoints.
X distance: {{{x[2]-x[1]=7-(-2)=9}}}
Divide the distance by {{{3{{{ to find the {{{x}}} distance between the points. 
{{{dx=9/3=3}}}
Y distance: {{{y[2]-y[1]=1-3=-2}}}
Divide the distance by {{{3}}} to find the {{{y}}} distance between the points. .
{{{dy=-2/3}}}
Now start at the first point and add ({{{dx}}},{{{dy}}}) to get the next point.
({{{-2,{{{3)+({{{3,{{{-2/3)=({{{-2+3,{{{3-2/3)=({{{1}}},{{{9/3-2/3}}})=({{{1}}},{{{7/3}}})
Do the same thing with the new starting point.
({{{1,{{{7/3}}})+({{{3}}},{{{-2/3}}})=({{{1+3}}},{{{7/3-2/3}}})=({{{4}}},{{{5/3}}})
And again to get the final point which should be ({{{7}}},{{{1}}}).
({{{4,{{{5/3}}})+({{{3}}},{{{-2/3}}})=({{{4+3}}},{{{5/3-2/3}}})=({{{7}}},{{{3/3}}})=({{{7}}},{{{1}}})