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
The equation is the variation statement with the constant's value in place - and the constant multiplies the whole bracket.The full step-by-step working and final answer, plus the video lesson for this topic, are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question