Possible Solutions
The cost of bananas per pound is represented in the table below.
Pounds of Bananas
Cost ($)
2
2.50
3
3.75
5
6.25
7
8.75
Write an equation that represents the cost of buying
x
amount of bananas.
Possible Solution 1
In a proportional relationship problem,
k
is the unit rate. In this problem, the
amount paid for one pound of bananas is the unit rate. This number can be
determined by finding
, such as
or
, etc.
The unit rate is $1.25 per pound and represents the
k
in the equation
y = kx
.
The solution is
y = 1.25x
.
Possible Solution 2
You can use the table to determine the slope of the line represented in the
table. This value is
k
in the equation
y = kx
.
Since all the ratios simplify to 1.25 and the cost of 0 bananas is $0, the 1.25 is
the k in the equation.
The cost of bananas per pound is represented in the table below.
Pounds of
Bananas
Cost
($)
