O-LevelMathematicsAlgebra and graphs4024/22 · May/June 2021 · Q38 Marks
Simplify 4a-b+6b-7a.
- (a)Simplify 4a-b+6b-7a.[2]
- (b)Solve m/2 - 4 = 5.[2]
- (c)Rearrange u = (t+4)/3 to make t the subject.[2]
- (d)Expand 3y(2y² + 5).[2]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [2] (a) 5b-3a final answer B1 for 5b – 3a seen or answer -3a + kb or ka + 5b
- [2] (b) 18 M1 for m/2 = 5+4 or m-4 * 2 = 5 * 2 or better
- [2] (c) 3u-4 or 3u-4 nfww M1 for 3u = t + 4 or u - t/3 = 4/3
- [2] (d) 6y³ + 15y final answer B1 for 6y³ + 15y seen or answer 6y³ + ... or ... + 15y
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