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Answer: 1/4 of a minute to drain 18 litres of water ( 15 seconds)

Explanation:

find slope or rate using two points on the line.

(0, 360) and (5, 0) and use slope formula y2- y1 over x2-x1

0 - 360 over 5 - 0 = -360/5, reduced to -72 rate

m = -72

b = 360

x = time

y = 360 - 18 drained = 342

y=mx + b is your slope intercept formula

342 = -72x + 360

subtract 360 from both sides

342 - 360 = -72x + 360 - 360

simplify

-18 = -72x

divide both sides by -72

-18 / -72 = -72/-72 x

simplify

-18/-72 = x

reduce your fraction

1/4 = x

so 1/4 of a minute or 15 seconds to drain 18 liters of water

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