Question

M is directly proportional to z and m is 63 when z is 9.

Answer 1

Constant of proportionality equation:

y = kx

m is directly proportional to z

m = kz

k= constant of proportionality.

m= 63 when z = 9

• a)

m= kz

63 =9k

Solve for k

63/9 = k

k= 7

• b)

m= 7z

• c)

42= 7z

Solve for z

42/7 = z

z= 6