1. Give an example of an ordered pair (take a guess if you don’t know).

2. In real life we study patterns and trends to try and predict or prevent what might happen in the future. The table below shows the estimated number of sea turtles found stranded on the Texas Gulf Coast over several months in a recent year. Sea Turtles Stranded If we think of January as month 1, how could we write the data in the table as ordered pairs? Month Number Jan 22 Feb 29 March 43 April 76 May 41

3. Now use the ordered pairs to graph the data below. What do you notice? Explain.

4.  The first coordinate in an ordered pair is called the x-coordinate  The second coordinate in an ordered pair is called the y-coordinate.  A set of ordered pairs, such as the one above for the sea turtles, is a relation.  The set of all x-coordinates is called the domain of the relation.  The set of all y-coordinates is called the range of the relation.

5.  A relation can be shown in several ways:  Ordered Pairs Table Graph ( -2, 3 ) (- 1,- 1) ( 0, 2 ) ( 1, 3 ) Name the domain of the relation above __________________________ Name the range of the relation above ____________________________

6. Ex 1) Express the relation { ( -2,4), ( 2, -2), ( 3,3), ( 4, 2 ), (3,-1)} as a table and as a graph. Then determine the domain and range.

7. Ex 2) Express the relation shown on the graph as a set of ordered pairs and in a table. Then determine the domain and range. TableOrdered PairsDomain & Range

8. State the domain and range of the relation below. (Use braces) (2,1) (-5,4) (-8,0) (1/2,4)

9. Year 190019201940196019802000 Number of Students (millions) 15.521.625.436.141.746.6 A.) Determine the domain and range of the relation. Domain:Range: B. Graph the relation. Be sure to label the x and y-axis. C.During which time period was there the greatest increase in the number of students enrolled in public schools?

10. What is the solution of the equation 2 x + 3 = 7 ? What is the solution of the equation 2 x + y = 4 ?

11. How many solutions are there? Can you name them?

12.  Conclusion: If your equation has 2 variables, the solutions will be _____________________ that make the equation true.

13. Ex 1) Which of the ordered pairs are solutions of 2 x + 3 y = 6 Show work and answer yes / no. ( 0, 2 )( 3, - 1 ) ( 6, -2 )

14. Ex 2 ) Which of the ordered pairs are solutions of y = 3 x – 4 ( 1, - 2 ) ( -2, - 10 )

15. Create an equation using x and y that has a solution of (3,1) and you cannot use x+y=4

16. Come up with an equation that uses x and y and has a solution (1,4) Ex. x+y=5 Now come up with an equation that uses multiplication and has solution (2,3) Ex. 2x+y=7

18.  Ex 3) Solve y = 2 x - 1 if the domain is { -2, -1, 0, 1, 2 }. Then graph your solutions.  What do you notice?  x y___

19.  Ex 4 ) Solve 4 x + 2 y = 8 if the domain is { -2, -1, 0, 1, 2 } Then graph your solutions.  x y___

20. Write your birthday (month and year) Work with a partner to come up with an equation that has at least 2 of these solutions

21. Any equation that graphs a line is called a ______________________ equation. Sometimes it is in standard form: _________________________. Sometimes it is solved for y which makes it easier to graph.