Symmetricality

Five equations and five unknowns. Is there an easy way to find the unknown values?

Problem

Symmetricality printable sheet

 

Here is a set of five equations:

$$b+c+d+e=4$$
$$a+c+d+e=5$$
$$a+b+d+e=1$$
$$a+b+c+e=2$$
$$a+b+c+d=0$$

What do you notice when you add the five equations?

Can you now find the values of $a, b, c, d$ and $e$?

 

Here is a different set of equations:

$$xy = 1$$
$$yz = 4$$
$$zx = 9$$

What do you notice when you multiply the three equations given above? 

Can you now find the values of $x, y$ and $z$?

Is there more than one possible set of values?

 

Here is a third set of equations:

$$ab = 1$$
$$bc = 2$$
$$cd = 3$$
$$de = 4$$
$$ea = 6$$

Can you find all the sets of values ${a, b, c, d, e}$ that satisfy these equations?

 

Extension

You may like to have a go at Overturning Fracsum.

Can you create your own set of symmetrical equations?