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Equations enable us to describe complex problems in simple
terms. They are built with numbers, pronumerals
and an equal sign.
It is clear that the number sentence
5 + 10 = 15
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
x + 10 = 15
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 7 to a number, the answer is 16.
b. When I subtract 8 from a number, the answer is 23.
c. When I multiply a number by 9, the answer is 27.
d. When I divide a number by 5, the answer is 29.
Solution:
Remember:
An equation is a statement consisting of number(s) and
pronumeral(s) that
are linked together with an equal sign.
Key Terms
equation, number sentence
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