Answer:
5x, constant of proportinality = 5
10/5x, constant of proportinality = 2
5/25x, constant of proportinality = 1/5
1/2x, constant of proportinality = 1/2
So, A is correct.
Let me know if this helps!
A
Explanation:
compare the coefficients of the x-term; you want to see the number 5
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