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Level 5-6 Algebra - Graphs 01
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Level 5-6 Algebra - Graphs 01

Plot and read straight-line graphs in KS3 Maths. Use coordinates, recognise gradients and intercepts, and link tables, equations, and points on Cartesian axes.

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(quiz starts below)

Fascinating Fact:

A recipe scale up is linear, if 2 cups of flour make 8 pancakes then 3 cups make 12 pancakes, points 2, 8 and 3, 12 lie on the same line.

In KS3 Maths, you’ll explore linear graphs. You’ll plot points from a table, read coordinates, recognise the gradient (steepness) and the y-intercept, and link equations to their straight-line graphs.

  • Coordinate: An ordered pair (x, y) that shows a point’s position on a grid.
  • Gradient: How steep a line is; the change in y divided by the change in x.
  • y-intercept: The value of y where a line crosses the y-axis (x = 0).
How do I plot a straight-line graph from an equation?

Make a small table of x-values, calculate matching y-values, plot at least two points, then draw a straight line through them with a ruler.

What does the gradient mean in KS3 graphs?

The gradient is the line’s steepness. It is the change in y for a 1-unit change in x. A bigger gradient means a steeper line.

How can I find the y-intercept from y = mx + c?

The y-intercept is c. It’s the y-value where the line crosses the y-axis, which happens when x = 0.

1 .
Which of the following is the correct way of writing coordinates?
(3, 4)
3 + 4
3, 4
34
Coordinates are written in pairs and placed in brackets. The x coordinate is always placed first and the y coordinate second
2 .
Which of these points is furthest from the y-axis?
(2, -3)
(-5, 5)
(-2, 1)
(7, -3)
The distance from a point to a line is always measured at right angles to the line so the distance from the y-axis is the x coordinate of the point
3 .
Which of these points is furthest from the x-axis?
(2, -3)
(-5, 5)
(-2, 1)
(7, -3)
The distance of a point from the x-axis is the y coordinate of the point
4 .
All points with x coordinate equal to 3 are on the line with equation …….
y = 3
x + y = 3
x = 3
y = x + 3
The rule is that x is always equal to 3
5 .
Points such as (4, 4) which have x and y coordinates the same are all on the line with equation …….
x + y = 4
x = y
y = 4x
x = 4
The rule is that x is always equal to y
6 .
Which of these points is on the y-axis?
(5, -5)
(5, 0)
(-5, 0)
(0, -5)
All points on the y-axis have an x coordinate of zero
7 .
Which of these points is not on the line x + y = 6?
(2, 4)
(3, -3)
(5, 1)
(-1, 7)
The coordinates must add up to 6
8 .
Which of these points is 6 units down from and 5 units to the right of the origin?
(5, 6)
(-6, 5)
(5, -6)
(-6, -5)
The first number in coordinates gives the position along the x (horizontal axis). Be careful with questions like this where the first number given to you is along the y axis!
9 .
Which of these points is on the line y = x - 2?
(2, -4)
(-4, 2)
(-2, 4)
(-2, -4)
The rule is that y is always 2 less than x
10 .
Which point will you arrive at if you start at (1, 3) and move 3 units to the left and 3 units up?
(4, 2)
(-2, 6)
(4, 6)
(0, -4)
Movements to the left are negative so remove 3 from the x axis. Movements upward are positive so add 3 to the y axis
You can find more about this topic by visiting BBC Bitesize - Graphs

Author:  Frank Evans (Specialist 11 Plus Teacher and Tutor)

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