A line passes through (-4,8) and (6,10). What is the equation of the line?
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Not addition, since 
and 0 doesn't belong to the set.
Not subtraction, since
.
It is closed under multiplication. The set appears to contain all non-zero multiples of 3.
Not division, since dividing some of the numbers results in rationals which do not belong to the set.
What other operations are you supposed to consider?
Not subtraction, since
It is closed under multiplication. The set appears to contain all non-zero multiples of 3.
Not division, since dividing some of the numbers results in rationals which do not belong to the set.
What other operations are you supposed to consider?