Mathematics · Oct / Nov 2025 · Paper 42 · Question 21
0580
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The question as text
0580/42/O/N/25 © UCLES 2025 21 y is inversely proportional to ( ) x 2 2 Ì . w is proportional to x. When , . y x 8 3 5 ¤ ¤ . When , w x 15 90 ¤ ¤ . Find y in terms of w. y ¤ [4]
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242 y = oe final answer + (6 w 2) 2 [4]
+ 2 8(3.5 2)
M3 for may be done in stages 2 90 + 15 w 2 or for correct answer seen then spoiled OR 242
M2 for y = + 2 ( x 2) k
or M1 for y = oe or better + ( x 2) 2 x oe
B1 for w = 6
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