IDNLearn.com provides a seamless experience for finding the answers you need. Ask anything and get well-informed, reliable answers from our knowledgeable community members.

At the performance of Seussical the Musical at your local high school, there are adult tickets and student/child tickets. You're trying to remember the cost of each to tell your extended family to come see the musical. Your friend, her mom, and her little sister paid a total of [tex]$\$[/tex]23[tex]$ on opening night, and you know that another family paid $[/tex]\[tex]$39$[/tex] for two adults and three students. If [tex]$x$[/tex] is the cost of adult tickets and [tex]$y$[/tex] is the cost of student tickets, the two equations for these situations can be written as:

[tex]\[
\begin{array}{l}
x + y = 23 \\
2x + 3y = 39
\end{array}
\][/tex]

Convert to slope-intercept form, and use a graphing calculator to graph both equations. (Leave in fraction form, do not round.)

[tex]\[
\begin{array}{l}
y = -\frac{1}{1} x + 23 \\
y = -\frac{2}{3} x + \frac{13}{3}
\end{array}
\][/tex]

What is the point that is the solution to this system?

[tex]\[
(\square, \square)
\][/tex]

This means that adult tickets cost [tex]$\$[/tex] \square[tex]$ and student/child tickets cost $[/tex]\[tex]$ \square$[/tex].


Sagot :

To solve for the cost of adult and student/child tickets, we start by expressing the given problem as a system of equations based on the given information.

Step 1: Write the equations.

From the given data:
1. Your friend, her mom, and her little sister paid a total of \[tex]$23. 2. Another family paid \$[/tex]39 for two adults and three students.

We can write these situations as follows:

1. [tex]\( x + y = 23 \)[/tex]
2. [tex]\( 2x + 3y = 39 \)[/tex]

where [tex]\( x \)[/tex] is the cost of an adult ticket and [tex]\( y \)[/tex] is the cost of a student/child ticket.

Step 2: Convert to slope-intercept form.

We convert each equation to the slope-intercept form, [tex]\( y = mx + b \)[/tex].

For the first equation:
[tex]\( x + y = 23 \)[/tex]
Subtract [tex]\( x \)[/tex] from both sides:
[tex]\( y = 23 - x \)[/tex]

For the second equation:
[tex]\( 2x + 3y = 39 \)[/tex]
Subtract [tex]\( 2x \)[/tex] from both sides:
[tex]\( 3y = 39 - 2x \)[/tex]
Divide all terms by 3:
[tex]\( y = \frac{39 - 2x}{3} \)[/tex]

Thus, we have:
1. [tex]\( y = 23 - x \)[/tex]
2. [tex]\( y = \frac{39 - 2x}{3} \)[/tex]

Step 3: Graph the equations.

Graph both equations to find the point of intersection using a graphing calculator:

For [tex]\( y = 23 - x \)[/tex]:

This is a straight line with a slope of -1 and a y-intercept of 23.

For [tex]\( y = \frac{39 - 2x}{3} \)[/tex]:

This is a straight line with a slope of [tex]\(-\frac{2}{3}\)[/tex] and a y-intercept of 13.

Step 4: Find the point of intersection.

The point where both lines intersect represents the solution to the system of equations. By solving the system algebraically (setting the equations equal):

[tex]\[ 23 - x = \frac{39 - 2x}{3} \][/tex]

Multiply through by 3 to clear the fraction:
[tex]\[ 3(23 - x) = 39 - 2x \][/tex]
[tex]\[ 69 - 3x = 39 - 2x \][/tex]
Add [tex]\( 3x \)[/tex] to both sides:
[tex]\[ 69 = 39 + x \][/tex]
Subtract 39 from both sides:
[tex]\[ 30 = x \][/tex]

So [tex]\( x = 30 \)[/tex].

Substitute [tex]\( x = 30 \)[/tex] back into the first equation:
[tex]\[ 30 + y = 23 \][/tex]
Subtract 30 from both sides:
[tex]\[ y = 23 - 30 \][/tex]
[tex]\[ y = -7 \][/tex]

Step 5: Interpret the solution.

The point that is the solution to this system is [tex]\( (30, -7) \)[/tex].

This means that adult tickets cost \[tex]$30 and student/child tickets have a calculated cost of \$[/tex]-7, implying an error in the problem setup or interpretation since ticket prices generally cannot be negative.

Summary:

- The point of intersection is [tex]\( (30, -7) \)[/tex].
- This means that adult tickets cost \[tex]$30 (which is unlikely). Typically, a correct setup should not result in negative values for prices. However, the answer derived from the given constraints is: - The cost of an adult ticket is \$[/tex]30.
- The cost of a student/child ticket is [tex]\(-\$7\)[/tex] (which is not feasible).