Question

Answer to Number 4. r-k = 15 Solve for K

Answer 1

R - 2k = 15...subtract r from both sides
-2k = 15 - r ...divide both sides by -2
k = (15 - r) / -2 or k = -7.5 + (r/2)

Answer 2

K=45 20-k/15=7 subtract 20 from both sides. -k/15=3 multiply both sides by 15. -k=-45 change the signs equally on both sides. k=45