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Solve 9x-4y=-109 and 7x+89=y using the substitution method.

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gdblu | eNotes Newbie

Posted June 21, 2013 at 5:41 AM via web

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Solve 9x-4y=-109 and 7x+89=y using the substitution method.

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 21, 2013 at 6:06 AM (Answer #1)

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The set of equations 9x - 4y = -109 and 7x+89=y has to be solved for x and y.

Substitute y = 7x+89 in 9x - 4y = -109

=> 9x - 4(7x+89) = -109

=> 9x - 28x - 356 = -109

=> 19x = -247

=> x = -13

y = 7*(-13) + 89 = -2

The solution of the set of equations is x = -13 and y = -2

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