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Find the ordered triple (p,q,r) that satisfies the following system:

p - 2q = 3

q - 2r = -2 + q

p + r = 9 + p

 Jun 5, 2023
 #1
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Find the ordered triple (p,q,r) that satisfies the following system:

p - 2q = 3

q - 2r = -2 + q

p + r = 9 + p

 

 

For identification, we'll call the three equations 1, 2, and 3.  

 

p - 2q = 3           (eq 1)  

q - 2r = -2 + q     (eq 2)  

p + r = 9 + p        (eq 3)  

 

per (eq 3)                                            p + r  =  9 + p  

subtract p from both sides                         r  =  9  

 

per (eq 2)                                           q – 2r  =  –2 + q  

subtract q from both sides                      –2r  =  –2  

divide both sides by –2                               r  =  1  

 

If the system is to be valid, then  

r cannot be equal to both 9 and 1,  

so there must be something wrong  

with the problem as stated.                  cannot be solved  

.

 Jun 5, 2023

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