W.A.L.T: Reading and Writing Co-ordinates. Our Aim To locate things using co-ordinate grids. 1 3 2 4...

W.A.L.T: Reading and W.A.L.T: Reading and Writing Co-ordinatesWriting Co-ordinates

Our AimOur Aim• To locate things using co-ordinate

grids.

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DefinitionDefinition• x axis – a horizontal number

line on a coordinate grid.

1 2 3 4 50 6 x

HintHint• x ‘is a cross’

(across )

1 2 3 4 50 6 x

DefinitionDefinition• y axis – a vertical number line

on a coordinate grid.

12345

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6

y

DefinitionDefinition• Coordinates – an ordered pair

of numbers that give the location of a point on a grid. (3, 4)

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1 2 3 4 50 6

(3,4)

HintHint• The first number is always the x or first letter

in the alphabet. The second number is always the y the second letter in the alphabet.

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(3,4)

How to Plot Ordered PairsHow to Plot Ordered Pairs• Step 1 – Always find the x value

first, moving horizontally.

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(2, 3)

y

x

How to Plot Ordered PairsHow to Plot Ordered Pairs• Step 2 – Starting from your new

position find the y value by moving up.

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(2, 3)(2,3)y

x

How to Find Ordered PairsHow to Find Ordered Pairs• Step 1 – Find how far over horizontally

the point is by counting to the right (positive) or the left (negative).

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(5, 4)

y

x

How to Find Ordered PairsHow to Find Ordered Pairs• Step 2 – Now count how far

vertically the point is by counting up (positive) or down (negative).

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(5,4)

y

x

What is the ordered pair?What is the ordered pair?

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1 2 3 4 50 6

(3,5)

y

x

What is the ordered pair?What is the ordered pair?

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6

1 2 3 4 50 6

(2,6)

y

x

What is the ordered pair?What is the ordered pair?

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1 2 3 4 50 6

(4,0)

y

x

What is the ordered pair?What is the ordered pair?

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1 2 3 4 50 6

(0,5)

y

x

What is the ordered pair?What is the ordered pair?

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6

1 2 3 4 50 6

(1,1)

y

x

Plot This Ordered PairPlot This Ordered Pair

-2

0-1

12

-3

3

-2 -1 0 1 2-3 3

(-1, 2)(-1, 2)

y

x

Plot This Ordered PairPlot This Ordered Pair

-2

0-1

12

-3

3

-2 -1 0 1 2-3 3

(1, -1)(1, -1)

y

x

Plot This Ordered PairPlot This Ordered Pair

-2

0-1

12

-3

3

-2 -1 0 1 2-3 3

(2, -2)(2, -2)

y

x

Plot This Ordered PairPlot This Ordered Pair

-2

0-1

12

-3

3

-2 -1 0 1 2-3 3

(-3, -2)(-3, -2)

y

x