Example22 - In Example and Example , a unique answer...

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Example 1 Solve for  x  and  y Adding the equations eliminates the  y -terms.  Now inserting 5 for  x  in the first equation gives the following:  Answer:   x  = 5,  y  = 2  By replacing each  x  with a 5 and each  y  with a 2 in the original equations, you can see that each  equation will be made true. 
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Unformatted text preview: In Example and Example , a unique answer existed for x and y that made each sentence true at the same time. In some situations you do not get unique answers or you get no answers. You need to be aware of these when you use the addition/subtraction method....
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