A smartphone's battery charge, , in percent, after hours of continuous use is modeled by the equation . If this equation is graphed in the -plane, which of the following is the best interpretation of the -coordinate of the line's -intercept?
The initial battery charge of the smartphone, in percent
The rate at which the battery charge decreases, in percent per hour
The total amount of charge consumed by the smartphone, in percent
The number of hours of continuous use until the smartphone's battery is completely drained
