Must Know Math Grade 7 by Wendy Hanks

Author:Wendy Hanks
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2020-07-15T00:00:00+00:00

Um . . . that is obviously not true. That’s how we know that this equation has no solution.

Inequalities

An equation is a mathematical expression that says two quantities are equal. An inequality also relates two expressions but says that they are not necessarily equal. Here are the symbols we use for inequalities:

When we see a statement such as y > −4, we read it as y is greater than negative 4. On a number line, that looks like this:

We use an open circle dot to show that −4 itself is not a solution but that everything greater than −4 is.

When we see a statement such as x ≤ 3, we read it as x is less than or equal to 3. On a number line, that looks like this:

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