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What is #y# when #x=10#, if #y=8# when #x=20#?

Answer 1

Savannah Anderson

When #x = 10, color(blue)(y = 4#

Method 1: As per the data provided: When #color(blue)(x=20 , y = 8#

So when the value of #x# is halved, # x = 20 /2, color(blue)(x = 10#

The value of #y# is also halved # = 8/2 , color(blue)(y= 4#

Method 2

When #color(blue)(x=20 , y = 8#

The value of #y# is #0.4# times #x#.

#y = 0.4 xx color(blue)(20 = 8#

So, when #x = 10#

#y = 0.4xx 10#

#color(blue)(y = 4#

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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