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8M - 1.6 and Review
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A symbol or letter that is used to represent a value that can change is called a _____.
Variable
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Find an equation for the word problem: "Two less than a number is -8."
x - 2 = -8
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Find an equation for the word problem: "The sum of 5 and a number is -72."
x + 5 = -5
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Okay!
A value that does not change is called a _____.
Constant
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Solve (b/4) + a*24 = c for b
b = (c - a*24)*4
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Solve for c
c = (-4/9)*p
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Find an equation for the word problem: "The difference of a number and 3 is 9."
x - 3 = 9
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Solve: 7a - 33 = x for a
a = (x + 33)/7
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An equation that states a rule for a relationship among quantities.
Formula
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A mathematical statement where two expressions are shown to be equal is called an _____.
Equation
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Solve for r
r = 7 - ax
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