The variable Z is directly proportional to X. When X is 3, Z has the value 18. What is the value of Z when X = 1

Answer 1

Direct proportionality means

z/x = constant

z₁/x₁ = z₂/x₂

z₂ = (x₂/x₁)z₁

x₁ = 3

z₁ = 18

x₂ = 1

z₂ = (1/3)(18) = 6

Answer 2

X=3 Z=18 X*Z=18 3*Z=18 Z=6