y = kx
'k' is the constant of proportionality, or otherwise known as constant of variation.
y = 90
x = 3
90 = k(3)
90 = 3k
3k/3 = 90/3
k = 30
The constant of proportionality is 30.
Answer:
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1,000. 4,200 / 21 = 200. 5 * 200 = 1,000
