Homework Help: algebra - college

Posted by hog tied on Saturday, November 13, 2010 at 12:36pm.

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
11x + 8y = 103
22x – 7y = 68

algebra - college - Jen, Saturday, November 13, 2010 at 1:45pm
11x+8y=103 (1)
22x-7y=68 (2)
Multiply (1) by -2 to cancel the x's
-22-16y=-206 (3)
22x-7y=68 (2)
Add them together.
-23y=-138
Divide by -23
y=6
Now substitute y=6 into either equation (1) or (2) to solve for x.
Post your work and answer if you'd like it checked.
algebra - college - hog tied, Sunday, November 14, 2010 at 12:55pm
Hi Jen,
Okay here is what I got to solve for x

11x *6 + 8y = 72
66 + 8y
8y = 9
x = 9

Okay did I do this right?

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