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The graph represents the total charge, in dollars, by an electrician for $x$ hours of work. The electrician charges a onetime fee plus an hourly rate. What is the best interpretation of the slope of the graph?

$y=6x+18$

One of the equations in a system of two linear equations is given. The system has no solution. Which equation could be the second equation in the system?

Oxygen gas is placed inside a tank with a constant volume. The graph shows the estimated temperature $y$, in kelvins, of the oxygen gas when its pressure is $x$ atmospheres.

What is the estimated temperature, in kelvins, of the oxygen gas when its pressure is $6$ atmospheres?

An online bookstore sells novels and magazines. Each novel sells for $4, and each magazine sells for $1. If Sadie purchased a total of 11 novels and magazines that have a combined selling price of $20, how many novels did she purchase?

In the given equation, k is a constant. If the equation has infinitely many solutions, what is the value of k ?

How many liters of a 25% saline solution must be added to 3 liters of a 10% saline solution to obtain a 15% saline solution?

In the solution to the system of equations above, what is the value of x ?

A science teacher is preparing the 5 stations of a science laboratory. Each station will have either Experiment A materials or Experiment B materials, but not both. Experiment A requires 6 teaspoons of salt, and Experiment B requires 4 teaspoons of salt. If x is the number of stations that will be set up for Experiment A and the remaining stations will be set up for Experiment B, which of the following expressions represents the total number of teaspoons of salt required?

What is the slope of the graph of $y=\frac{1}{4}\left(27x+15\right)+7x$ in the xy-plane?

If , what is the value of ?

Maria plans to rent a boat. The boat rental costs $60 per hour, and she will also have to pay for a water safety course that costs $10. Maria wants to spend no more than $280 for the rental and the course. If the boat rental is available only for a whole number of hours, what is the maximum number of hours for which Maria can rent the boat?

Robert rented a truck to transport materials he purchased from a hardware store. He was charged an initial fee of $20.00 plus an additional $0.70 per mile driven. If the truck was driven 38 miles, what was the total amount Robert was charged?

A line passes through the points $\left(4,6\right)$ and $\left(15,24\right)$ in the xy-plane. What is the slope of the line?

$\frac{1}{4}\left(x+5\right)-\frac{1}{3}\left(x+5\right)=-7$

What value of $x$ is the solution to the given equation?

A discount airline sells a certain number of tickets, x, for a flight for $90 each. It sells the number of remaining tickets, y, for $250 each. For a particular flight, the airline sold 120 tickets and collected a total of $27,600 from the sale of those tickets. Which system of equations represents this relationship between x and y ?

$f\left(x\right)=2x+3$

For the given function $f$, the graph of $y=f\left(x\right)$ in the xy-plane is parallel to line $j$. What is the slope of line $j$?

What is the y-intercept of the line graphed?

The equation $46=2a+2b$ gives the relationship between the side lengths $a$ and $b$ of a certain parallelogram. If $a=9$, what is the value of $b$?

A movie theater charges $11 for each full-price ticket and $8.25 for each reduced-price ticket. For one movie showing, the theater sold a total of 214 full-price and reduced-price tickets for $2,145. Which of the following systems of equations could be used to determine the number of full-price tickets, f, and the number of reduced-price tickets, r, sold?

The function f is defined by , where m and b are constants. If and , what is the value of m ?

The population of snow leopards in a certain area can be modeled by the function P defined above, where is the population t years after 1990. Of the following, which is the best interpretation of the equation ?

For groups of $25$ or more people, a museum charges $\$21$ per person for the first $25$ people and $\$14$ for each additional person. Which function $f$ gives the total charge, in dollars, for a tour group with $n$ people, where $n\ge 25$?

If $y=5x+10$, what is the value of $y$ when $x=8$?

The shaded region shown represents the solutions to which inequality?

Last week, an interior designer earned a total of $\$\mathrm{1,258}$ from consulting for $x$ hours and drawing up plans for $y$ hours. The equation $68x+85y=\mathrm{1,258}$ represents this situation. Which of the following is the best interpretation of $68$ in this context?