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In order to solve a system of equation by substitution, you must always solve for y in one of the equations and then back-substitute. true or false

Mathematics
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true..
why cant you solve for x what is the difference
it depend on what type of unknown you use. like in your question, the unknown is in term of y.

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thanks
False. You could solve for x and back substitute. Or, what if your system of equations had no y-variable Such as: a + b = 7 5a - 7b = 10

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