Question

A watering can dispenses water at the rate of 0.20 gallon per minute. The original volume of water in the can was 8 gallons. Which set of ordered pairs shows the volume of water in the can in gallons (y), as a function of time in minutes (x), from the first minute after can starts dispensing water?

A.{(7.8, 1), (7.6, 2), (7.4, 3)}

B.{(1, 7.8), (2, 7.6), (3, 7.4)}

C.{(8.0, 1), (7.8, 2), (7.6, 3)}


D.{(1, 8.0), (2, 7.8), (3, 7.6)}

Answer 1

A watering can dispenses water it is losing water so we will subtract.
rate of 0.20 gallon per minute so m = -0.20
original volume of water in the can was 8 gallons means at the start when t = 0 then y = 8
using the linear equation y = m x + b we are given y, m and b we need to find y the number of gallons after one minute when x = 1