Question 359158
Slope is change in {{{y}}} over change in {{{x}}}.
Starting at ({{{3}}},{{{-1}}}) if I move {{{1}}} unit in {{{x}}}, I move {{{2}}} units in {{{y}}}.
({{{3}}},{{{-1}}})+({{{1}}},{{{2}}})=({{{3+1}}},{{{-1+2}}})=({{{4}}},{{{1}}})
Another point on the line is ({{{4}}},{{{1}}}).
Plot those two points and connect them with the line.
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{{{drawing(300,300,-6,6,-6,6,grid(1),circle(3,-1,0.2),circle(4,1,0.2),graph(300,300,-6,6,-6,6,2x-7))}}}