The equation of the regression line is y=80+4x. Find the value of slope and interpret what the slope measures in this situation.

An engineer determined that the weight of a car and gas mileage have a linear relationship. A car that weighs 3500 pounds has a gas mileage of 20 miles per gallon. Another car that weighs 2500 pounds has a gas mileage of 29 miles per gallon. Let x be the weight of the car and y be the gas mileage of the car in miles per gallon. Use the point-slope formula to write a linear equation.

What's true about the first differences and slope for a linear equation?

The scatter plot shows the number of years of experience, x, and the amount charged per hour, y, for each of 23 dog sitters in California. (a) Write an approximate equation of the line of best fit for the data. It doesn't have to be the exact line of best fit. (b) Using your equation from part (a), predict the amount charged per hour by a dog sitter with 10 years of experience. Note that you can use the graphing tools to help you approximate the line. Amount charged in dollars \per hour/ 22- 20+ 18+ 16+ 14+ 12+ 10- 8- 6- 4+ 2+ 0 2 4 X 6 X X +3 +: X 8 10 12 14 16 18 20 22 Years of experience X S (a) Write an approximate equation of the line of best fit. :0 y = (b) Using your equation from part (a), predict the amount charged per hour by a dog sitter with 10 years of experience. $0 x Ś