OpenStax, Elementary Algebra 2e §5.2 Solving Systems of Equations by Substitution · Example 9 · Algebra · Systems
Solving Systems of Equations by Substitution · Example 9
The sum of two numbers is zero. One number is nine less than the other. Find the numbers.
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OpenStax, Elementary Algebra 2e · §5.2 Solving Systems of Equations by Substitution · Example 9
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