ABOVE A1 Only allow with working 9 (c) Y = 2.5x 50 +3 A1 Y=128 M1 10 (a) x M1 = 4 sin20° × 1.368 metres A1 M1 siny = 10 (b) y A1 = 24.1° Q Answer Mark Comments Alternative method 1 (x first) Correctly multiplies at least one 5x + 4y = 4, y. equation and matches co-efficient of M1 Attempts appropriate choice of addition 6x 4y = 18 − or subtraction for their pair of equations. x = 2 A1 x) 5×(their + 4y = 4 y Correct method attempted to find or 6×(their x) 4y = 18 M1 − x) using (their x) or 3×(their 2y = 9 − y = A1 oe −1.5 Alternative method 2 (y first) Correctly multiplies both equations and 11 15x + 12y = 12, x. matches co-efficient of M1 15x 10y = 45 Attempts appropriate choice of addition − or subtraction for their pair of equations. y A1 oe = −1.5 y) 15x + 12×(their = 12 y) y or 15x 10×(their = 45 Correct method attempted to find − M1 x) or 5x + 4×(their y) = 4 using (their y) or 3x 2×(their = 9 − x A1 = 2 Alternative method 3 (y substitution) Rearranges to obtain equation for x and M1 or 10x +12x 36 = 8 attempts to solve it. –
9 (c) ABOVE A1 Only allow with working Y = 2.5x 50 +3 Y=128 A1 10 (a) M1 x = 4 × sin20° M1 1.368 metres A1 10 (b) siny = M1 y = 24.1° A1 Q Answer Mark Comments 11 Alternative method 1 (x first) 5x + 4y = 4, 6x − 4y = 18 M1 Correctly multiplies at least one equation and matches co-efficient of y. Attempts appropriate choice of addition or subtraction for their pair of equations. x = 2 A1 5×(their x) + 4y = 4 or 6×(their x) − 4y = 18 or 3×(their x) − 2y = 9 M1 Correct method attempted to find y using (their x) y = −1.5 A1 oe Alternative method 2 (y first) 15x + 12y = 12, 15x − 10y = 45 M1 Correctly multiplies both equations and matches co-efficient of x. Attempts appropriate choice of addition or subtraction for their pair of equations. y = −1.5 A1 oe 15x + 12×(their y) = 12 or 15x − 10×(their y) = 45 or 5x + 4×(their y) = 4 or 3x − 2×(their y) = 9 M1 Correct method attempted to find y using (their x) x = 2 A1 Alternative method 3 (y substitution) or 10x +12x – 36 = 8 M1 Rearranges to obtain equation for x and attempts to solve it.
PiXL-AQA-2017-Spec-Paper-3H-Mark-Scheme-Nov-2016-PPE.docx