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He is answering why the change in

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y, you like that, why the change in y?

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is x times negative j. So
say it again Zack.

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[Um it is h times the x value
and j is the x value.]

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Exactly.

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Your rate of change

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is a rate of change with
respect to

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x

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If you are traveling sixty
miles an hour

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and you go two hours

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that is an x value right?

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The product tells you the y

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so your rate of change changes
in respect to x, guess how much
your x changed

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negative j

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so your y value changes h times as much