Mathematics · May / June 2023 · Paper 21 · Question 20
0580
As printed in the paper
The question as text
The table shows some values for y x x 3 2 1 2 = - - . x -1 -0.5 0 0.5 1 1.5 y 4 -1 0 2.75
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
20(a)[1]
0.75 and –1.25 [1]
20(b)[3]
Correct curve [3]
B2 FT for 6 or 5 correct plots or B1 FT for 4 or 3 correct plots
20(c)[3]
= + ruled line y 2 x 1 −0.35 to −0.45 [4]
B2 B1 for correct equation [ ]2 = + y x 1 soi = + = + or y 2 x k or y kx 1 drawn B1
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