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26 votes
(90 Points)

(Score for Question 1: ___ of 10 points)
A local newspaper charges $42 per half-page advertisement and $86 per full-page advertisement. Kathryn has a budget of $1192 to purchase 20 advertisements.
• Define a variable for each unknown.
• Write a system of equations to represent the situation.
• How many full-page advertisements does Kathryn purchase?
• Show your work.
• How many half-page advertisements does Kathryn purchase?
Show your work.

User Dr Sokoban
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2.5k points

1 Answer

10 votes
10 votes

Answer:

Let x = number of half-page advertisements

Let y = number of full-page advertisements


\begin{cases} 42x + 86y = 1192\\ x + y = 20\end{cases}

8 full-page advertisements

12 half-page advertisements

Explanation:

Definition of variables

Let x = number of half-page advertisements

Let y = number of full-page advertisements

Given information:

  • cost per half-page advertisement = $42
  • cost per full-page advertisement = $86
  • total budget = $1192
  • number of advertisements to purchase = 20

Using the given information, we can write a system of equations:

Equation 1: 42x + 86y = 1192

Equation 2: x + y = 20

To solve the system of equations, rearrange Equation 2 to make x the subject:

⇒ x = 20 - y

then substitute this into Equation 1 and solve for y:

⇒ 42(20 - y) + 86y = 1192

⇒ 840 - 42y + 86y = 1192

⇒ 840 + 44y = 1192

⇒ 44y = 352

⇒ y = 8

Substitute the found value of y into Equation 2 and solve for x:

⇒ x + 8 = 20

⇒ x = 12

Therefore, Kathryn purchased:

  • 8 full-page advertisements
  • 12 half-page advertisements
User Kevin Krammer
by
2.9k points