1­5: Graph Proportional Relationships What is the Coordinate Plane​
? What are the Quadrants​
? What are ​
Ordered Pairs​
? II I III IV (­2, 9) The coordinate ​
plane ​
is a type of grid that is formed when two number lines intersect at their zero points. The number lines separate the coordinate plane into four regions called ​
quadrants​
. An ​
ordered pair ​
is a pair of numbers, such as (­2, 9), used to graph points on the coordinate plane. What is the X­Coordinate​
? What is the Y­Coordinate​
? Identify Proportional Relationships​
: Example 1a: Page 46 x­coordinate (​
­2​
, ​
9​
) y­coordinate James earns $5 an hour babysitting. Determine whether the amount of money James earns babysitting is proportional to the number of hour he babysits by graphing on the coordinate plane. Explain your reasoning. The ​
x­coordinate corresponds to a number on the x­axis. The ​
y­coordinate corresponds to a number on the y­axis. If the graph of the two quantities is a straight line through the origin, then the two quantities are proportional​
. Example 2b: Page 47 The table shows the number of Calories an athlete burned per minute of exercises. Determine whether the number of Calories burned is proportional to the number of minutes by graphing on the coordinate plane. Explain your reasoning. Calories Burned # of # of Minute Calorie
s s 0 0 1 4 2 8 3 13 Summary: