To find the perpendicular slope you need to flip the fraction and change the sign. So 1/2=2/1 and tge original slope was positive, so the slope is -2. Now you sub in the point (-7,-4) in for x and y in the formula y=mx+b and solve for b (sub in 2 for m as well) Y=mx+b -4=-2*-7+b -4=14+b -4-14=b B=-18 The equation is y=-2x-18
