Answer:

Step-by-step explanation:
Since the <em>rate</em><em> </em><em>of change</em><em> </em>[<em>slope</em>] is zero, that automatically makes our equation set equal to the y-coordinate of the ordered pair, which in this case is the y-intercept.
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Answer:
A
Step-by-step explanation:
Solution is in this picture.
1/x + 1/y = 8
x + y = 8
6/x + 12/y = 72n