1. ## solutions

How many solutions exist for this set of equation ?

ab=1 , bc=2 , ca=8

A . 1
B . 2
C. 3
D . 6

2. What have you tried so far? You've done something like solve the first and third equations for "a=", expressed "c" in terms of "b", and then solved the second equation for "c=", and... then what?

Hint : $a=2$ or $a=-2$.