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Mathematics and Statistics  annotated exemplars level 2 AS91256
Apply coordinate geometry methods in solving problems (2.1)
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This annotated exemplar is intended for teacher use only. The student work shown does not always represent a complete sample of what is required. Selected extracts are used, focused on the grade boundaries, in order to assist assessors to make judgements at the national standard.
Last updated July 2019. All annotations have been altered to identify the correct TKI resource.
Low Excellence
Commentary  

For Excellence, the student needs to apply coordinate geometry methods, using extended abstract thinking, in solving problems. This involves one or more of: devising a strategy to investigate or solve a problem, identifying relevant concepts in context, developing a chain of logical reasoning, or proof, forming a generalisation, and also using correct mathematical statements, or communicating mathematical insight. This student’s evidence is a response to the TKI task ‘Irrefutable Proof’. The student has developed a proof to show that the midpoints of a quadrilateral form a parallelogram (1). Correct mathematical statements have been used in the response. For a more secure Excellence, the student could improve the communication of the thinking for the general case, for example by explaining more clearly what they are doing at each step of the proof. 
High Merit
Commentary  

For Merit, the student needs to apply coordinate geometry methods, using relational thinking, in solving problems. This involves one or more of: selecting and carrying out a logical sequence of steps, connecting different concepts or representations, demonstrating understanding of concepts, forming and using a model, and also relating findings to a context, or communicating thinking using appropriate mathematical statements. This student’s evidence is a response to the TKI task ‘Irrefutable Proof’. The student has demonstrated an understanding of concepts by finding the coordinates of the midpoints of the first quadrilateral (1) and showing that these form a parallelogram (2). Thinking has been communicated using appropriate mathematical statements. The student has also started to consider the general case, by finding the midpoints of the general quadrilateral (3). To reach Excellence, the student would need to develop a chain of reasoning to prove the general case. 
Low Merit
Commentary  

For Merit, the student needs to apply coordinate geometry methods, using relational thinking, in solving problems. This involves one or more of: selecting and carrying out a logical sequence of steps, connecting different concepts or representations, demonstrating understanding of concepts, forming and using a model, and also relating findings to a context, or communicating thinking using appropriate mathematical statements. This student’s evidence is a response to the TKI task ‘Irrefutable Proof’. The student has connected different concepts by finding the equation of the mirror line (1), the equation of the perpendicular line (2), the point of intersection (3) and the coordinates of the reflected point (4). The findings have been related to the context. For a more secure Merit, the student could improve the strength of the communication of their thinking in the response, for example by explaining each step of the process. 
High Achieved
Commentary  

For Achieved, the student needs to apply coordinate geometry methods in solving problems. This involves selecting and using methods, demonstrating knowledge of geometric concepts and terms and communicating using appropriate representations. This student’s evidence is a response to the TKI task ‘Irrefutable Proof’. The student has selected and used gradient (1), gradient of a perpendicular line (2), equation of a line (3) and intersection of lines (4). The student has also demonstrated knowledge of geometric concepts and used appropriate representations in the response. To reach Merit, the student could solve the problem by finding the coordinates of the reflected point. 
Low Achieved
Commentary  

For Achieved, the student needs to apply coordinate geometry methods in solving problems. This involves selecting and using methods, demonstrating knowledge of geometric concepts and terms and communicating using appropriate representations. This student’s evidence is a response to the TKI task ‘Irrefutable Proof’. The student has selected and used gradient (1), gradient of a perpendicular line (2) and has found an equation of a line (3). This student has also demonstrated knowledge of geometric concepts and used appropriate representations in the response. For a more secure Achieved, the student could strengthen the communication and find the equation of the line perpendicular to the mirror line. 
High Not Achieved
Commentary  

For Achieved, the student needs to apply coordinate geometry methods in solving problems. This involves selecting and using methods, demonstrating knowledge of geometric concepts and terms and communicating using appropriate representations. This student’s evidence is a response to the TKI task ‘Irrefutable Proof’. The student has found the gradient of the mirror line (1). The working for the equation of the mirror line uses an incorrect gradient (2). To reach Achieved, the student could select and use one further method correctly, for example finding the correct gradient of the perpendicular line or the equation of the mirror line. 