Answer:
A) 1/4 min
Step-by-step explanation:
Find the equation for the graph:
y = mx + b
Find the slope using two random points (0, 360) and (5, 0)
m = (y2 - y1) / (x2 - x1)
m = (0-360) / (5-0)
m = -360/5
m = -72
b is 360, the y-intercept.
Substitute m= -72 and b=360 into slope-intercept form.
y = -72x + 360
x represents time and y represents the total amount of water at the time.
We are looking for when only 18 liters were drained.
360 - 18 = 342 <= Total amount of water when 18 liters are drained
Substitute 342 for y in the equation and isolate x.
342 = -72x + 360
-18 = -72x
x = 18/72
x = 1/4
Therefore, it will take 1/4 of a minute to drain 18 liters.
