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# Part 1 – Vertical and horizontal lines

Teacher resources for Part 1

- Coordinate grids – one quadrant (0 to 10) – for Alpha Exercise:
- Coordinate grids – four quadrants (-10 to 10) – for Beta and Gamma Exercises:

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Links to past exam questions

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# Part 2 – Lines of the form *y* = *mx* + *c*

Teacher resources for Part 2

- Coordinate grids – one quadrant (0 to 10) – for Alpha Exercise:
- Coordinate grids – four quadrants (-10 to 10) – for Beta and Gamma Exercises:

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Links to past exam questions

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Interactive GeoGebra activity: Identifying equations of straight line graphs

What is the equation of the line shown?

Interactive GeoGebra activity: Straight line graphs and coordinates

# Part 3 – Lines of the form *ax* + *by* = *k*

Teacher resources for Part 3

- Coordinate grids – one quadrant (0 to 10) – for Alpha Exercise:
- Coordinate grids – four quadrants (-10 to 10) – for Beta and Gamma Exercises:

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Links to past exam questions

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In the real world

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What next?

- A10a – Identifying and interpreting gradients and intercepts of linear functions graphically and algebraically – gradient and intercept should be your next topic, if you are not already familiar with them.
- A9b – Using
*y*=*mx*+*c*to identify parallel and perpendicular lines - A9c – Finding the equation of a line through two given points or through one point with a given gradient