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08-03-2017
Mathematics

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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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08-03-2017

5x + 10y = 18
x = y - 6

substituting y - 6 in for x in the first equation
5(y - 6) + 10y = 18
5y - 30 + 10y = 18
15y = 48
y = 3.2

x = y - 6
x = 3.2 - 6
x = -2.8

answer

(-2.8, 3.2)

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