Slope intercept form is given by
y = mx + b
here m is slope
and b is intercept
slope is already given by 3, so rest to find b intercept
b = y - mx
replace (x,y) by (-6,2)
then
b = 2- 3•(-6) = 20
So then finally equatioj in slope intercept form is
y = 3x + 20