Why do this problem?
has an unusual context for coordinates which will provide an extra challenge when the group are working on coordinates or the angle properties of shapes.
Pupils need to be encouraged to look very carefully at the angles of the triangles. Isometric paper is almost essential.
Do you think it would help to draw the triangle out on isometric paper?
What are the angles created in the small triangles on the paper?
When you're were working out the angles in the triangles did you notice how the sides cut through the grid triangles?
Learners could make their own graph on isometric paper.
Suggest doing a less unusual and less difficult problem on coordinates such as Two Number Lines