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Question:

In the equation P = 2x + 7, P represents the price, in dollars, of tickets to a concert x hours after they go on sale. When will the price exceed $20.00?

1. Describe in words how the equation can be used to solve the problem.

2. Draw a graphical representation of the price equation, and illustrate how a solution could be found that way.

User Simo
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2 Answers

6 votes
1. This equation can be used to help solve the problem by plugging in numbers for x. Whatever answer for x gives a price that is more than $20.00 is the answer for the number of tickets that have to be sold in order to exeed $20.00.

2. This equation has the same format as an equation in slope intercept form. This makes it easy to graph.The y intercept will be 7 and the slope is 2. Using this information, it is easy to graph the equation and find a solution. The graph should look like the image I attached to this answer.
Question: In the equation P = 2x + 7, P represents the price, in dollars, of tickets-example-1
User Iklinac
by
7.6k points
3 votes

Let

P-------> the price in dollars of tickets

x------> the number of hours

we know that


P=2x+7 -------> equation A

When will the price exceed $20.00?

Part 1) Describe in words how the equation can be used to solve the problem

Substitute the value of P equal to
\$20.00 in the equation A and find the value of x

so

For
P=\$20.00

substitute in equation A


20=2x+7


2x=20-7


2x=13


x=6.5\ hours

therefore

the answer Part 1) is

the price exceed
\$20.00 when the time exceed
6.5\ hours

Part 2) Draw a graphical representation of the price equation, and illustrate how a solution could be found that way.

using a graphing tool

Draw the equation of the lines


P=2x+7


P=20

the solution is the intersection both graphs

see the attached figure

the solution is the point
(6.5, 20)

that means

for
x=6.5\ hours


P=\$20.00

Question: In the equation P = 2x + 7, P represents the price, in dollars, of tickets-example-1
User EggBender
by
7.5k points

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