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並前往https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-with-substitution/v/the-substitution-method

Systems of equations with substitution: 2y=x+7 & x=y-4

Just substitute the value of x in the first equation into the other equation and solve for y. 4y - 2x = 13 4y - 2(3y - 4) = 13. Once you have solved that, ...

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