Here they give us the equation of the cost of a taxi ride. The cost in dollars of a taxi ride in Lynnwood is given by the equation where X is the number of miles travelled. So the model is of the form F of X equal MX plus B. The letter M signifies the slope. The slope or rate of change is equal to the number of dollars per mile. So if we thought about this, dollars or money is on top or our Y value and miles would be on bottom or our X value. The letter B signifies the constant or base cost of a taxi ride. The base cost of the taxi ride is $1.75 when 0 miles are traveled. Hence, you're going to get charged $1.75 just when the taxi shows up.