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Is the equation 3+z= -9 true false or open
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Is the equation 3+z= -9 true false or open

User Cassy
by
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2 Answers

4 votes
Subtract 3 from both sides

(z = -9 - 3)

Simplify -9 - 3 to -12

z = -12

3 + -12 = -9 so this is true.
User Peza
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7.8k points
7 votes
3+z = -9 is open since you do not have a value for z
User Cowirrie
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7.9k points
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