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May 19, 2013

# Homework Help: Algebra

Posted by Vic on Sunday, July 3, 2011 at 12:33am.

The problem is 9x+4y=-12
x=26-5y

Solve by substitution method

• Algebra - Henry, Monday, July 4, 2011 at 2:57pm

Eq1: 9X + 4Y = -12.
Eq2: X = 26 - 5Y.

In Eq1, substitute 26 - 5Y for X:
9(26-5Y) + 4Y = -12,
234 - 45Y + 4Y = -12,
-41Y = -12 -234 = -246,
Y = 8.

In Eq2, substitute 6 for Y:
X = 26 - 5*6 = -4.

Solution Set = (X,Y) = (-4,6).

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