Solving Systems of Linear Equations: Graphing Answers

Which r-value represents the weakest correlation?

Which r–value represents the strongest negative correlation?

The table shows the shipping costs for items of different values.

The function f(x) is graphed below.What is the equation of the line that is perpendicular to f(x) and passes through the point (4, –6)?

Which relationships would most likely be causal? Select two options.a positive correlation between the number of homework assignments completed and the grade on the exama positive correlation between the temperature in a canyon in the early spring and the number of snakes seen by hikersa positive correlation between a child’s shoe size and reading speeda negative correlation between the time a glass of ice water sits on the counter and its temperaturea positive correlation between the number of students attending football games and the number of games that are won

Titus works at a hotel. Part of his job is to keep the complimentary pitcher of water at least half full and always with ice. When he starts his shift, the water level shows 8 gallons, or 128 cups of water. As the shift progresses, he records the level of the water every 10 minutes. After 2 hours, he uses a regression calculator to compute an equation for the decrease in water. His equation is W –0.414t + 129.549, where t is the number of minutes and W is the level of water. According to the equation, after about how many minutes would the water level be less than or equal to 64 cups?

Which graph shows data whose r-value is most likely closest to 0?

Mr. Palmer does an experiment to investigate the effects of distractions on studying and learning. He gives each participant a line with 10 words to memorize in 5 minutes. Some of the participants are interrupted during the 5 minutes with text messages from friends. The graph shows the number of words remembered after 5 minutes and the number of text messages sent to the participants as distractions.

A 2-column table with 4 rows. The first column is labeled x with entries 0, 5, 10, 15. The second column is labeled y with entries 15, 10, 5, 0.

Which best describes the strength of a model with an r-value of 0.29?

An electrician charges a flat fee plus an hourly rate for a service call. She charges a total of $94 for a 3-hour service call on Monday and $130 for a 5-hour service call on Tuesday. How much should she charge for a 2-hour service call?

What is the x-intercept of the line containing the points (–6, 10) and (12, –2)?

What is the slope of a line that is perpendicular to the line y = x + 5?

The cost, c, of a health club membership is related linearly to its length in months, m. If a 12-month membership costs $260 and an 18-month membership costs $380, which equation can be used to find the cost of a 30-month membership?

The number of times a player has golfed in one’s lifetime is compared to the number of strokes it takes the player to complete 18 holes. The correlation coefficient relating the two variables is –0.26.

Latitude and longitude describe locations on the Earth with respect to the equator and prime meridian. The table shows the latitude and daily high temperatures on the first day of spring for different locations with the same longitude.Which statement describes the slope of the line of best fit for the data?

Which statement is true about the graphs of the two lines y = x + 2 and y = x ?

Which table shows a negative correlation?

What is the equation of the line that is parallel to the line x = –2 and passes through the point (–5, 4)?