Answer:
see explanation
Explanation:
The equation of proportionality is
y = kx ← k is the constant of proportionality
k = y ÷ x, thus
k = 160 ÷ 25 = 320 ÷ 50 = 480 ÷ 75 = 640 ÷ 100 = 6.4
and
y = 6.4x ← equation of proportionality
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