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There are two unknowns you are trying to find, and you cannot express one in terms of the other. Describe how you could use algebra to solve for the unknowns.
When you solve systems with two variables and therefore two equations, the ... of any variable is 1, which means you can easily solve for it in terms of the other ... In the substitution method, you use one equation to solve for one variable and ... Look for a variable with a coefficient of 1 … that's how you'll know where to begin.
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