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For every value of a, the graph of each of these three equations is a line:

ax + y = 1

x  + ay = 1

x + y = 9

 

For what value of a do all three of these lines intersect at the same point?

 Feb 2, 2022
 #1
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\(\color{brown}\boxed{-7\over9}\)

.
 Feb 3, 2022

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