8 when 1 point Suppose y is directly proportional to a and y

8 when (1 point) Suppose y is directly proportional to a and y (a) Find the constant of proportionality and a formula for y. help (formulas) (b) Use your formula to find z when y 16 help (numbers)

Solution

y = kx

now 8 = k(2) => k =4 = constant of proportionality

16 = 4x => x = 4

P = kd^1.5

365 = k(93000000)^1.5 => k = 4.06976 x 10^-10 s/mile^1.5

P = 4.06976 x 10^-10 d^1.5

b) P =  4.06976 x 10^-10 67000000^1.5 = 223.2 days