Question

If (x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2. Find x or y as indicated.

Answer 1

(3.6, 5) and (7.2, y)
a.
y = 2.5
c.
y = 15
b.
y = -12
d.
y = 3.8

Answer 2

x1y1 = k
x2y2 = k
Thus x1y1 = x2y2
Thus, (3.6)(5) = (7.2)(k)
k = (3.6x5) / (7.2) = ?

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