Luttrell 2012
95
Name: ______________________
Date: _____
6k – Linear Word Problems
You can identif
y
a linear equation even if it is written in the jargon of a word problem. The
biggest clue is to identif
y
a constant change in the values. If you read the cost for a pencil is
$0.50, then two pencils should cost $1.00. Then identify
y
our variables, choosing those not
easily mistaken for a number. Convert given values into ordered pairs. Find the slope and then
write the equation. Once
y
ou have an equation, you can predict almost an
y
thing.
Solve:
1. Pencils are sold at the bookstore for 49 cents each. How much would 75 pencils cost?
2. Some reception halls have a flat fee for use of the hall and then a fee of $25 or more for each
person the
y
will be serving. For a wedding reception, Black Forest Inn charges about $64 per
person plus $5500 for the use of their inn. How much will it cost my brother to host a wedding
of 250 people?
3. An auto repair shop charges $25 an hour. They say your muffler needs to be replaced for
$65. It takes them 2.5 hours to fi
x
your e
x
haust s
y
stem. How much will the bill be?
4. To frame an oil painting, framers charge a rate based on the perimeter of the painting.
You choose a polished wooden frame that has a price tag of $8 a foot. Will the price
of framing e
x
ceed
y
our $125 budget if
y
our painting is 3.5' b
y
2.5'?
5. A Nissan Sentra sold in 1996 for $17,000. Ten years later its worth is $3,400. How much
would it be worth in another five years, if the depreciation followed a linear model? (In real life,
cars depreciate exponentially.)