Question 262518
We start with 
{{{y = mx + b}}}
we are given (x,y) as (3,-7) and a slope, m = -2. replacing the variables with our numbers, we get
{{{-7 = 3*(-2) + b}}}
So, we can find b as
{{{b = -1}}}
now, we have m and b. So, we can say
{{{y = -2x - 1}}}