GB-23-05-001 · Plotting a straight line
The equation of a line is .
(a) Complete the table.
| x | -2 | -1 | 0 | 1 | 2 |
|---|---|---|---|---|---|
| y |
(b) Draw the line on the grid.
Part (a)
Coordinate Geometry: Plotting Straight Line Graphs
Booklet p. 78
Method
1) Sub each x-value into equation using brackets ( )
2) Plot each (x, y) coordinate pair
3) Join with a straight ruled line
Worked Example (GB-23-05-001 · Part (a))
Complete the table.
| x | -2 | -1 | 0 | 1 | 2 |
|---|---|---|---|---|---|
| y |
1)
Substitute each x value using brackets, for example .
2)
| x | -2 | -1 | 0 | 1 | 2 |
|---|---|---|---|---|---|
| y | -2 | 1 | 4 | 7 | 10 |
Ans =
-2, 1, 4, 7, 10
Part (b)
Coordinate Geometry: Plotting Straight Line Graphs
Booklet p. 78
Method
1) Sub each x-value into equation using brackets ( )
2) Plot each (x, y) coordinate pair
3) Join with a straight ruled line
Worked Example (GB-23-05-001 · Part (b))
Draw the line on the grid.
1)
Substitute each x value using brackets, for example .
2)
| x | -2 | -1 | 0 | 1 | 2 |
|---|---|---|---|---|---|
| y | -2 | 1 | 4 | 7 | 10 |
3)
Plot the points and use a ruler to join them with a straight line.
4)
Ans =
Straight line through (-2,-2), (0,4), (2,10).