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System of equations help, please?

 5x + 10y = 18 x = y - 6 Which of the following equations is the result of substituting y - 6 in for x in the first equation?

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Carol H. | Experienced Mathematics Tutor w/ Master's Degree in MathExperienced Mathematics Tutor w/ Master'...
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5x + 10y = 18
5(y-6) + 10y = 18
5y - 30 + 10y = 18
15y = 48
y = 3.2