For all real values of c, the pair of equations x – 2y = 8 and 5x – 10y = c have a unique solution. Justify your answer.
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x-2y=8
5x-10y=c
5 (x-2y)=c
5×8=c
c=40
5x-10y=c
5 (x-2y)=c
5×8=c
c=40
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