### Enclosing Squares

Can you find sets of sloping lines that enclose a square?

### Parallel Lines

How does the position of the line affect the equation of the line? What can you say about the equations of parallel lines?

### Reflecting Lines

Investigate what happens to the equations of different lines when you reflect them in one of the axes. Try to predict what will happen. Explain your findings.

# Graphical Triangle

##### Stage: 3 Short Challenge Level:
See all short problems arranged by curriculum topic in the short problems collection

What is the area, (in square units) of the triangle formed by the three lines whose equations are: $y-x=6$, $x-2y=3$ and $x+y=6$?

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.