O-LevelMathematicsAlgebra and graphs4024/21 · May/June 2019 · Q410 Marks
Express as a fraction in its simplest form.
- (a)Express as a fraction in its simplest form.
- (a)(i)6y / 35 ÷ 10y² / 7[2]
- (a)(ii)k²-16 / k²-2k-8[3]
- (b)Solve 3(x-4) +5 = 7.[2]
- (c)Solve 3t²+5t-4 = 0. Show all your working and give your answers correct to 2 decimal places.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [2] 3/25y final answer B1 for 3/25y seen or 42y/350y² or better
- [3] (k+4)/(k+2) final answer B1 for (k + 4)(k−4) B1 for (k-4)(k + 2)
- [2] M1 for 3x – 12 = 7-5 or x - 4 = (7-5)/3
- [3] -5 ± √5² - 4×3×(-4) / 2×3 oe B2 B1 for √5² - 4×3×-4 oe or -5±√r / 2×3 oe B1 0.59 and -2.26
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