Question

The Kwon family has a rainwater catchment system they use to water their garden. After 3 days without rain, the depth of water in the tank is 63 inches. After 5 days, the depth is 57 inches.

What will the depth of water in the tank be after 17 days?

Answer 1

What tank?

Answer 2

(3,63),(5,57), (17,y).

m = (57-63)/(5-3) = -6/2 = -3.

m = (y-57)/(17-5) = (y-57)/12 = -3/1
y-57 = -36
Y = 57-36 = 21 Inches after 17 days.