Plotting Graphs
Maths: Edexcel IGCSE Higher, topic 3.3.1
Coordinates
Co-ordinates involve plotting an x (horizontal) co-ordinate and a y (vertical) co-ordinate.
Point (2,1)
- The point (2,1) has x-coordinate 2 and y-coordinate 1.
Axes
- The x-axis is the horizontal axis. On the x axis, the y co-ordinate is 0.
- The y-axis is the vertical axis. On the y axis, the x co-ordinate is 0.
Straight Line Graphs
Vertical lines
- Vertical lines are written as:
- x = 2
Horizontal lines
- Horizontal lines are written as y = a:
- y = 1
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Straight lines through the origin
- Sloping lines are written as y = mx.
- m tells you the gradient of the line.
- If m is negative the graph slopes down from top left to bottom right.
- The larger m is, the steeper the slope of the line is.
Test yourself on Plotting Graphs
What are the coordinates of point A?
What are the coordinates of point B?
What are the coordinates of point C?
What are the coordinates of point D?
What are the coordinates of point E?