Question 355861
{{{-3}}} is a fraction, the denominator is just {{{1}}}.
Maybe thinking about it that way will help you.
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So start with the y-intercept ({{{0}}},{{{2}}}).
The slope is change in {{{y}}} divided by change in {{{x}}}.
So if I move {{{1}}} unit in {{{x}}}, I should move {{{-3}}} units in {{{y}}}. 
({{{0}}},{{{2}}})+({{{1}}],{{{-3}}})=({{{0+1}}},{{{2-3}}})=({{{1}}},{{{-1}}})
So then ({{{1}}},{{{-1}}}) is another point on the line.
Plot those two points and connect them with the line.
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{{{drawing(300,300,-6,6,-6,6,grid(1),circle(0,2,0.3),circle(1,-1,0.3),graph(300,300,-6,6,-6,6,-3(x-0)+2))}}}