8. k = y/x = 36/9 = 4 15. k = y/x = 1200 / 0.6 = 20000 y = kx....y = 4x...when x = 3 y = 20000x when y 1800 y = 4(3) 1800 = 20,000x y = 12 <== 1800/20000 = x 0.09 = x 9. k = y/x = 15/3 = 5 x = 9% <== y = kx...y = 5x...when y = 25 25 = 5y 16. k = y/x = 0.45/5 = 0.09 5 = y <=== y = 0.09x...when x = 7 y = 0.09(7) y = 0.63 <==