For the P=-4 what you do is subtracting 6 to the 38 you will have -8p=32 then you will divide-8 to both sides and your answer will be p=-4 check 6-8(-4)=38 6+32=38 38=38
i got K=5.6 what you do is add 13 to the 15 and you will have 28=5k then you will divide 5 to both sides and you will have k=5.6 check 15=5(5.6)-13 15=28-13 15=15
