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2.2 Literal Equations and Formulas McGraw Hill (2.2文字麦格劳希尔方程和公式)
2.2 Literal Equations and Formulas
2.2 OBJECTIVE
1. Solve a literal equation for a specified variable
Many problems in algebra require the use of formulas for their solution. Formulas are sim-
ply equations that express a relationship between more than one variable or letter. You are
already familiar with a number of examples. For instance,
1
P R B A h b P 2L 2 W
2
are formulas for percentage, the area of a triangle, and the perimeter of a rectangle,
respectively.
One useful application of the equation-solving skills we considered in Section 2.1 is in
NOTE A literal equation is any rewriting these formulas, also called literal equations, in more convenient equivalent
equation that involves more forms.
than one variable or letter. Generally, that more convenient form is one in which the original formula or equation is
solved for a particular variable or letter. This is called solving the equation for a variable,
and the steps used in the process are very similar to those you saw earlier in solving linear
equations.
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