Straight-line graphs

What you'll learn

1. 1

   Imagine a graph is like a map. A straight-line graph shows how two things are linked — like time and distance.

2. 2

   Here's a simple straight line going through (0,0) and (2,4).

3. 3

   What shape is a straight-line graph?

4. 4

   Let's find the gradient (steepness) of a line that goes from (0,0) to (3,6).

5. 5

   Drag the point to make a line with gradient 3 that goes through (0,0).

6. 6

   What is the gradient of a line that goes up 4 and right 2?

7. 7

   Now find the equation of a line with gradient 2 that goes through (0,1).

8. 8

   What is the y-intercept of the line y = 3x + 5?