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Name:___________________
Writing Equations
1. Doubling a child’s height on his or her second birthday gives a close estimate of his or her
final adult height. Make a table and graph that gives the approximate adult height of a twoyear-old in terms of his or her current height.
2-year-old height, x (in inches)
Adult height, y (in inches)
31
32
33
34
35
36
37
Now make a rule using symbols to represent the prediction of a child’s adult size.
Let x =
Let y =
Linear Equation:
38
Name:___________________
2.) A car rental company charges a flat fee of $29 and an additional $0.15 per mile to rent a
compact car. Make a table and graph to model the total charge in dollars in terms the number
of miles driven.
Miles (x)
Cost (y)
25
50
75
100
125
150
175 200 225 250 275 300
Now make a rule using symbols to represent the cost of renting a car.
Name:___________________
3. A photographer charges $50 for a sitting and a basic package of photos. Additional 5 x 7
pictures cost $12 each. Make a table and write an equation that gives the total cost in
dollars in terms of how many extra 5 x 7 pictures you purchase.
4. In 1996, the enrollment in a school was approximately 1400 students. During the next three
years, the enrollment increased by approximately 30 students per year. Make a table and
write an equation to model the school’s enrollment E in terms of t, the number of years since
1996.
5. Use the equation in Exercise 8 to estimate the school’s enrollment in the year 2002.