O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2023 · Q224 Marks
y is directly proportional to w². x is inversely proportional to w. When w = 10, y = 5 and x = 0.4. Find y in terms of x. Give your answer in its simplest form.
- y is directly proportional to w². x is inversely proportional to w. When w = 10, y = 5 and x = 0.4. Find y in terms of x. Give your answer in its simplest form.[4]
Mark scheme
Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.
- 22 [y=] 4 / (5x²) final answer
- 22 or [y =] 0.8 / x² final answer
- 22 B3 for 4/x = √(20y) or y/x² = 0.05 oe
- 22 or y = (1/20)x² oe seen
- 22 OR B2 for y = w²/20 oe and x = 4/w oe
- 22 or B1 for y = w²/20 oe or x = 4/w oe
- 22 or y = kw² and x = c/w
- 22 OR B2 for y = k/x²
- 22 M1 for 5 = k / 0.4²
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →