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Answers
Answer:
a,d it is the right answer
Answer:
Option (b) and option (c) are the answers
Step-by-step explanation:
Constant of proportionality means where the rise or fall of a ratio becomes constant or uniform.
In option(b) the graph has a constant slope of 25 OR more precisely a constant speed of 25 miles/hour as per cordinate geometry slope formula. i.e
Slope= (Y2-Y1) /(X2-X1)
Similarly in option (c) the total earnings are increasing at the rate of 25 per hour.
As we ccan see that 75$ was earned for a worl duration of 3 hours.
Therefore, the earnings per hour is 25 $
Also, the earnings increased from 75 to 125 in 2 hours i.e from 3 hours to 5 hours. Thus, the rate of earning increase per hours is (125-75)/(5-3). Which again gives 25 contant rate of earning per hour