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25 August, 17:52

How can you recognize whether a real-world problem should be represented by an equation or inequality?

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  1. 25 August, 18:51
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    An equation:

    It is used to express exact values.

    Therefore, we will use an equation when when know that the quantity given is strictly equal to a given value.

    Examples:

    1 - Price of a kilo of apples is $2

    This is translated as ... > cost of 1 kilo = $2

    2 - The length of a ruler is 30 cm

    This is translated as ... > length = 30 cm

    An inequality:

    It is used to show relation or compare between a quantity and a value. Therefore, we use it when we find keywords as "at least, at most, greater than, less than, ... etc"

    Example:

    1 - The distance between two cities is at least 20 miles.

    This means that the distance can be 20 miles or more

    This is translated as:

    distance ≥ 20 miles
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