At time x = 0, water begins to drip steadily out of a water tank. After 1 hour, there are 8.7 gallons of water in the tank. After 6 hours, 7.2 gallons remain. Write a linear function rule that models the number of gallons of water y left in the tank for any number of hours x.

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.

What is your question?

It is the top one. the answer is -7. that is smallest