Question 1073748
Parallel lines have identical slopes.
{{{m[1]=m[2]=-4}}}
So using the point-slope form,
{{{y-(-1)=-4(x-(-2))}}}
{{{y+1=-4(x+2)}}}
{{{y+1=-4x-8}}}
{{{y=-4x-9}}}
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*[illustration L17.JPG].