>>12068113y=-8x+2 tells us our slope of our line must be -8. Differentiate the equation to get y'=4x, The slope is -8, so this holds only when x=-2 and from this the line intersects (-2,9). Pluggig it in point slope form, one gets (y-9)=-8(x+2) which gives y+7=-8x, or 8x+y+7=0.
