Stage: 4 and 5 Challenge Level: 
Solve the system of equations:
$ab = 1$
$bc = 2$
$cd = 3$
$de = 4$
$ea = 6$
Stage 5 - Core Mapping. Polynomials. Discussion. Calculus generally. Stage 5 - Reviewed 2012. Mathematical reasoning & proof. Simultaneous equations. Weekly Challenge. Manipulating algebraic expressions/formulae. Maths in STEM.
Published December 1997.
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