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A number sentence that has a left-hand side, a right-hand side and an equal
sign is called an equation.
We know that:
Clearly, both 6 + 9 and 3 × 5 have the same value of 15. So we can
express this as the following equation:
Similarly, a number sentence such as
is an equation because:
Note:
Using Pronumerals in Equations
Clearly, the number sentence
is an equation.
If the value of the pronumeral x is 5, then x can take the
place of 5; and we can write this equation as
This is an equation containing the pronumeral x. The value
of the pronumeral x is 5.
Example 1
Describe each of the following equations in words:
Solution:
Example 2
Write an equation to represent each of the following statements:
a. When I add 6 to a number, the answer is 15.
b. When I subtract 5 from a number, the answer is 18.
c. When I multiply a number by 4, the answer is 20.
d. When I divide a number by 3, the answer is 9.
Solution:
Key Term
equation
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