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# Coordinate geometry

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### Coordinate geometry

1. 1. By Vivek Thilak *
2. 2. Copyright © 2000 by Monica Yuskaitis * * Grid – A pattern of horizontal and vertical lines, usually forming squares.
3. 3. Copyright © 2000 by Monica Yuskaitis * * Coordinate grid – a grid used to locate a point by its distances from 2 intersecting straight lines. A B C D E 1 2 3 4 5 What are the coordinates for the house?
4. 4. Copyright © 2000 by Monica Yuskaitis * * x axis – a horizontal number line on a coordinate grid. 1 2 3 4 50 6 x
5. 5. Copyright © 2000 by Monica Yuskaitis * * x is the shortest and likes to lie down horizontally. 1 2 3 4 50 6 x
6. 6. Copyright © 2000 by Monica Yuskaitis * * Coordinates – an ordered pair of numbers that give the location of a point on a grid. (3, 4) 1 2 3 4 5 0 6 1 2 3 4 50 6 (3,4)
7. 7. Copyright © 2000 by Monica Yuskaitis * * y axis – a vertical number line on a coordinate grid. 1 2 3 4 5 0 6 y
8. 8. Copyright © 2000 by Monica Yuskaitis * * y is the tallest and stands upright or vertically. 1 2 3 4 5 0 6 y
9. 9. Copyright © 2000 by Monica Yuskaitis * * 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. 1 3 2 4 5 0 6 1 2 3 4 50 6 (3,4)
10. 10. Copyright © 2000 by Monica Yuskaitis * * Step 1 – Always find the x value first, moving horizontally either right (positive) or left (negative). 1 3 2 4 5 0 6 1 2 3 4 50 6 (2, 3) y x
11. 11. Copyright © 2000 by Monica Yuskaitis * * Step 2 – Starting from your new position find the y value by moving vertically either up (positive) or down (negative). 1 3 2 4 5 0 6 1 2 3 4 50 6 (2, 3) (2,3)y x
12. 12. Copyright © 2000 by Monica Yuskaitis * * Step 1 – Find how far over horizontally the point is by counting to the right (positive) or the left (negative). 1 3 2 4 5 0 6 1 2 3 4 50 6 (5, ) y x
13. 13. Copyright © 2000 by Monica Yuskaitis * * Step 2 – Now count how far vertically the point is by counting up (positive) or down (negative). 1 3 2 4 5 0 6 1 2 3 4 50 6 (5,4) y x
14. 14. Copyright © 2000 by Monica Yuskaitis * 1 3 2 4 5 0 6 1 2 3 4 50 6 (3,5) y x