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OpenStudy (anonymous):
u=-b+21 u=-2b+30 ordered pairs
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OpenStudy (apoorvk):
Well, equate the two values of 'u': -b + 21 = -2b + 31 solve this^, and find out the value of 'b'. Substitute that in any one of the original equations and get the numerical value of 'u'. Express them in (u,b)=(..., ...) form, which'll be the ordered pair satisfying this system of equations.
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