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It may help to keep one variable fixed and just change the other one:
you could keep the gradient fixed and change the intercept,
or you could keep the intercept fixed and change the gradient.
How do these changes affect the equation of the line?
Parallel Lines
Age 11 to 14
Challenge Level 
It may help to keep one variable fixed and just change the other one:
you could keep the gradient fixed and change the intercept,
or you could keep the intercept fixed and change the gradient.
How do these changes affect the equation of the line?
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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.