For nonlinear models (equations) the slope is constant. Is this a True or False statement?

TRUE OR FALSE. If the relationship of x and y is perfectly linear, we can say that x causes y.

I need help answering the second part of this question:

Please help with 6

A clothing business finds there is a linear relationship between the number of shirts,n, it can sell and the price,p, it can charge per shirt. In particular, historical data shows that 6000 shirts can be sold at a price of $56, while 9000 shirts can be sold at a price of $35. Give a linear equation in the form p = mn + b that gives the price p they can charge for ʼn shirts. Answer: p= Round the value of your slope to three decimal places. Be careful to use the proper variable and use the Preview button to check your syntax before you submit your answer.

Based on data collected from various moving companies, a homeowner uses the linear model y=1.5x+150y=1.5x+150 to predict the total cost of renting a moving truck, yy, for xx minutes. If the homeowner rents a moving truck for 6060 minutes, which statement best describes the slope of the linear model?

A 1700-gallon tank is initially full of water. The water is drained at a rate of 16 gallons per minute. Write a linear equation, in slope-intercept form, that models this situation. (Note: "y =" is already given -- just enter the right side of the equation.) y = In the equation, the variable x represents which of the following? (Choose one) time elapsed while water drains (minutes) amount of water drained from the tank (gallons) rate at which water drains (gallons per minute) amount of water still in the tank (gallons) In the equation, the variable y represents which of the following? (Choose one) amount of water still in the tank (gallons) amount of water drained from the tank (gallons) time elapsed while water drains (minutes) O rate at which water drains (gallons per minute) How much water is in the tank after 18 minutes? gallons