Date | May 2017 | Marks available | 2 | Reference code | 17M.1.SL.TZ2.T_4 |
Level | Standard Level | Paper | Paper 1 (with calculator from previous syllabus) | Time zone | Time zone 2 |
Command term | Find | Question number | T_4 | Adapted from | N/A |
Question
Line LL intersects the xx-axis at point A and the yy-axis at point B, as shown on the diagram.
The length of line segment OB is three times the length of line segment OA, where O is the origin.
Point (2, 6)(2, 6) lies on LL.
Find the equation of LL in the form y=mx+cy=mx+c.
Find the xx-coordinate of point A.
Markscheme
6=−3(2)+c6=−3(2)+cOR(y−6)=−3(x−2)(y−6)=−3(x−2) (M1)
Note: Award (M1) for substitution of their gradient from part (a) into a correct equation with the coordinates (2, 6)(2, 6) correctly substituted.
y=−3x+12y=−3x+12 (A1)(ft) (C2)
Notes: Award (A1)(ft) for their correct equation. Follow through from part (a).
If no method seen, award (A1)(A0) for y=−3xy=−3x.
Award (A1)(A0) for −3x+12−3x+12.
[2 marks]
0=−3x+120=−3x+12 (M1)
Note: Award (M1) for substitution of y=0y=0 in their equation from part (b).
(x=) 4(x=) 4 (A1)(ft) (C2)
Notes: Follow through from their equation from part (b). Do not follow through if no method seen. Do not award the final (A1) if the value of xx is negative or zero.
[2 marks]