Respuesta :

y = kx find k

21 = k*3
k = 7

Equation:
y = 7x
Find x when y = 42
42 = 7x
x = 42/7
x = 6

answer: x = 6  when y = 42
olemakpadu
y α x

y = cx          where c = constant of proportionality 

cx = y

c = y/x

y = 21, x = 3,          y = 42,  x = ?

y/x = c

21/3 = 42/x

7 = 42/x

x = 42/7

x = 6

so x = 6

Hope this explains it.

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