Homework Help: Linear Equations

Posted by Wayne on Tuesday, May 24, 2011 at 5:30pm.

Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this.
10x - y = 12.5
3x + y = 7

Linear Equations - Henry, Wednesday, May 25, 2011 at 7:58pm
Eq1: 10X - Y = 12.5.
Eq2: 3X + Y = 7.
Add the 2 Eqs and get:
13X + 0 = 19.5.
X = 1.5.

In Eq1, substitute 1.5 for X:
10*1.5 - Y = 12.5,
15 - Y = 12.5,
Y = 2.5.

Solution set: (X,Y) = (1.5,2.5).

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