For what value(s) of k will the relation not be a function?

A = {(1.5k−4, 7), (−0.5k+8, 15)}

4 answers

for every value of x we want one and only one value of y
if
1.5 k - 4 = -0.5 k + 8
then we have TWO values of y for ONE value of x
k = 6 does it
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