Linear Equation Worksheet With Answers Page 7
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83. Biologists have found that the number of chirps some crickets make per minute is related to
temperature. The relationship if very close to being linear. When crickets chirp 124 times a minute, it is
about 68 degrees Fahrenheit. When they chirp 172 times a minute, it is about 80 degrees Farenheit.
Identify the variables in this situation: x= ____temperature___ y=
__# of chirps per minute
What is the given information in this problem (find all that apply)?
y-intercept __-148______
slope __4___
a. Find an equation for the line that models this situation.
(y – 124) = 4(x – 68)
y = 4x - 148
b. How warm is it when the crickets are chirping 150 times a minute?
74.5 degrees Fahrenheit
MORE WORD PROBLEM PRACTICE:
1. Nick is given $50 to spend on a vacation . He decides to spend $5 a day. The amount Nick has left
and the number of days are related.
Identify the variables in this situation: x= ___days_______
y= _money____________
What is the given information in this problem (find all that apply)?
y-intercept ___50_____
slope _-5____
a. Write an equation relating x and y.
y = -5x + 50
b. Use your equation to find out when Nick will have $15 left.
7 days
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