ECZ 2018 · GCE Paper 1 — Variation
Two variables x and y are such that y varies directly as (x² + 1), and when x = 2, y = 20. Find the equation connecting y and x.
- A. y = 4x²
- B. y = 4(x² + 1)
- C. y = 4x² + 1
- D. y = x² + 4
Verified working — step 1
With k = 4 (from 20 = k(2² + 1)), the connecting equation is y = 4(x² + 1), i.e. y = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
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