Question 112889
Parallel means it has the same slope, so first find the slope 
of the given line.
{{{y = 3x + 21}}} This is in the form {{{y = mx + b}}} where m
is the slope, so
{{{m = 3}}}
Passes through the point (-3,-7). With the slope and one point, I can find
the equation, using the point-slope formula.
{{{m = (y - y[1]) / (x - x[1])}}}
where ({{{x[1]}}}, {{{y[1]}}}) = (-3,-7)
{{{3 = (y - (-7)) / (x - (-3))}}}
{{{3 = (y + 7) / (x + 3)}}}
{{{3(x + 3) = y + 7}}}
{{{3x + 9 = y + 7}}}
{{{y = 3x + 2}}} answer