4-2 Writing Equations in Slope-Intercept Form
The cost to order 8 tickets should be another $52 more than the cost of 7 tickets. So, the cost is $379 + 52 or $431.
A music store is offering a Frequent Buyers Club membership. The membership costs $22 per year, and
then a member can buy CDs at a reduced price. If a member buys 17 CDs in one year, the cost is $111.25.
Determine the cost of each CD for a member.
Write a linear equation to represent the total cost y of a one year membership, if x CDs are purchased.
Graph this equation.
a. Write an equation in slope-intercept form to find the cost of each CD for a member where y = 111.25, x =17, and
b = 22. Then, solve for m.
So, the cost of each CD for a member is $5.25.
b. The total cost of a one-year membership if x CDs are purchased, can be represented by the linear equation y =
5.25x + 22.
c. To graph the equation, plot the y-intercept (0, 22) and the point (17, 111.25). Draw a line through the points.
Tess and Jacinta are writing an equation of the line through (3, 2) and (6, 4). Is either of
them correct? Explain your reasoning.
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