The water is receding at a rate of one foot per day. Write the slope-intercept form of the equation that represents y

Question

A river currently contains 40 feet of water. The water is receding at a rate of one foot per day. Write the slope-intercept form of the equation that represents y, the amount of water remaining in the river, as a function of x, the number of days.

Answer 1

y = feet of water

x = number of days

change in y is -1 foot per each day

so slope is -1.

amount of water is 40 at day 0, so y-intercept is 40.

y = 40 - x