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
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