Question

Draw the temperature-time graph in each of the following cases:

Time (in hours):	7:00	9:00	11:00	13:00	15:00	17:00	19:00	21:00
Temperature (°F) in:	100	101	104	102	100	99	100	98

Answer 1

Here, time is an independent variable and temperature is a dependent variable. So, we take time on the x-axis and temperature on the y-axis.
Let us choose the following scale:
​For point (ii):
On x-axis: 2 cm = 2 hours
On y-axis: 1 cm = 1^οF
Let us assume that on the x-axis, the coordinate of origin is 6:00.
On y-axis, the coordinate of origin is 94^οF .
So, the coordinates of O are (6:00, 94).
Now, let us plot (7:00, 100), (9:00, 101), (11:00, 104),..(21:00, 98) for point (i) and (8:00, 100), (10:00, 101), (12:00, 104),...,(20:00, 100) for point (ii). These points are joined to get the graphs representing the given information as shown in the figures below.​