Question 325010
Start with the point-slope form.
{{{y-yp=m(x-xp)}}}
Parallel lines have identical slopes so {{{m=1}}}
{{{y-(-1)=1(x-(-2))}}}
{{{y+1=x+2}}}
{{{highlight(y=x+1)}}}
It's the same line.
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{{{drawing(300,300,-5,5,-5,5,circle(-2,-1,.2),grid(1),graph(300,300,-5,5,-5,5,x+1, x+1))}}}