5. (6, 3) M1 and o.e. or a drawing used correctly [2] 6. (y =) 2x 3 o.e. B2 – B1 for 3 or 2x + where and mx c m – are integers with and c m ≠ 0 3 c ≠ [2] 7. (k =) 8 M1 for 0 = 2 × 4 or better k – [2] 8. (a) = 2x 6 2 y – W1 2x + or W1 6 c mx – (b) (3, 0) 1ft For = 2x + only, allow (–k/2, 0) y k [3] 9. (a) or 4 o.e. 2* –1.5x M1 any 2 operations completed correctly SC1 (3x 8)/–2 – (b) or 1.5 –3/2 – 1√ from their equation in (a) (c) (0, 4) 1√ from their equation in (a) [4]
5. (6, 3) M1 and o.e. or a drawing used correctly [2] 6. (y =) 2x – 3 o.e. B2 B1 for mx – 3 or 2x + c where m and c are integers with m ≠ 0 and c ≠ 3 [2] 7. (k =) 8 M1 for 0 = 2 × 4 – k or better [2] 8. (a) y = 2x – 6 2 W1 2x + c or W1 mx – 6 (b) (3, 0) 1ft For y = 2x + k only, allow (–k/2, 0) [3] 9. (a) or 4 –1.5x o.e. 2* M1 any 2 operations completed correctly SC1 (3x – 8)/–2 (b) –3/2 or – 1.5 1√ from their equation in (a) (c) (0, 4) 1√ from their equation in (a) [4]
straight-line-graphs-ms.docx