12 Table of values Line B3 for correct line between = and = 4 x x −2 2 1 0 1 x = − − (B2) OR 2 3 4 (for a correct straight line segment through at least 3 of = 5 2 y − 8 − − (−2,−8), (−1, −5), (0, −2), (1, 1), (2, 4), (3, 7), (4,10) 1 4 7 10 or for all of these plotted but not joined or for a line drawn with a positive gradient through (0, and −2) OR clear intention to use a gradient of 3, e.g. line through (0, and (0.5, 1) −2) Using = + y mx c, (B1) OR gradient = 3, (for at least 2 correct points stated or plotted ) intercept = y –2 or for a line drawn with a positive gradient through (0, −2) or a line with gradient 3) 13 (a) Correct B2 correct reflection shape at (– 3, 2), (– 3, 5), (– 4, 5),(– 5, 1) – reflection (B1) (reflection in a different line parallel to = 1 or 3 vertices correct) x – (b) Enlargement, B2 enlargement, scale factor 2, centre P scale factor 2, (B1) (for 2 correct aspects) centre P NB score B0 for more than one transformation 14 (i) Explanation C1 e.g. has multiplied before squaring (ii) Explanation C1 e.g. evaluated (–4)2 incorrectly, or not correctly inserted brackets.
12 Table of values x = − 2 − 1 0 1 2 3 4 y = − 8 − 5 − 2 1 4 7 10 OR Using y = mx + c, gradient = 3, y intercept = –2 Line B3 for correct line between x = −2 and x = 4 (B2) OR (for a correct straight line segment through at least 3 of (−2,−8), (−1, −5), (0, −2), (1, 1), (2, 4), (3, 7), (4,10) or for all of these plotted but not joined or for a line drawn with a positive gradient through (0, −2) and clear intention to use a gradient of 3, e.g. line through (0, −2) and (0.5, 1) (B1) OR (for at least 2 correct points stated or plotted ) or for a line drawn with a positive gradient through (0, −2) or a line with gradient 3) 13 (a) Correct reflection B2 correct reflection – shape at (– 3, 2), (– 3, 5), (– 4, 5),(– 5, 1) (B1) (reflection in a different line parallel to x = – 1 or 3 vertices correct) (b) Enlargement, scale factor 2, centre P B2 enlargement, scale factor 2, centre P (B1) (for 2 correct aspects) NB score B0 for more than one transformation 14 (i) Explanation C1 e.g. has multiplied before squaring (ii) Explanation C1 e.g. evaluated (–4)2 incorrectly, or not correctly inserted brackets.
gcse_1ma1_mark_scheme_2f__mock_set_2_.docx