If y ∝ x and x = 5, y = 210 and x = 2, then find y _____?
- 84
- 99
- 70
- None of these
Explanation
Given y ∝ x, we can write y = kx.
When x = 5, y = 210:
210 = k(5)
k = 210/5
k = 42
Now, when x = 2:
y = kx
y = 42(2)
y = 84
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