INTERPRETING GRAPHS
About "Interpreting graphs"
Interpreting graphs :
In this section, we are going to see, how to describe a relationship between two variables x and y by interpreting the graph.
Interpreting graphs - Examples
Example 1 :
A square tile has a side length of x inches. The equation aaa y = x² gives the area of the tile in square inches. Determine whether the rate of change between the side length and area of a square is constant using the graph. And also describe whether the relationship between the two variables is linear.
Solution :
Step 1 :
Choose several values for the input x. Plug these values for x in the equation to find the output y.
x
1
2
3
4
x²
1²
2²
3²
4²
y
1
4
9
16
(x, y)
(1, 1)
(2, 4)
(3, 9)
(4, 16)
Step 2 :
Graph the ordered pairs. Then draw a line through the points to represent the solutions of the function.
Step 3 :
Describe the relationship between x and y.
The graph is not a straight line. So the rate of change between the side length and area of a square is not constant.
Only a straight line graph will represent a linear relationship. Since the graph is not a straight line, the relationship between the two variables x and y is non linear.
Example 2 :
The temperature of a fish tank was 82 °F and decreased steadily 2 °F every hour. The equation y = -2x + 82 gives the temperature y after x hours. Determine whether the rate of change between the time and temperature is constant. And also describe whether the relationship between the two variables is linear.
Solution :
Step 1 :
Choose several values for the input x. Plug these values for x in the equation to find the output y.
x
0
1
2
3
4
5
-2x + 82
-2(0) + 82
-2(1) + 82
-2(2) + 82
-2(3) + 82
-2(4) + 82
-2(5) + 82
y
82
80
78
76
74
72
(x, y)
(0, 82)
(1, 80)
(2, 78)
(3, 76)
(4, 74)
(5, 72)
Step 2 :
Graph the ordered pairs. Then draw a line through the points to represent the solutions of the function.
Step 3 :
Since the graph is a straight line, the rate of change between the time and temperature is constant.
Since the rate of change is constant and the graph is a straight line, the relationship between the two variables x and y is linear.
After having gone through the stuff given above, we hope that the students would have understood "Interpreting graphs".
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