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How do you solve the system $x - y = 4$ $x - y = 4$ , $3 x - 3 y = 6$ $3x - 3y = 6$ ?

1 Answer

Nov 29, 2015

This pair of equations has no solutions. The equations represent 2 (non-intersecting) parallel lines.

Explanation:

$x - y = 4$ $x-y=4$
$\Rightarrow 3 x - 3 y = 12$ $rArr 3x-3y = 12$

which is incompatible with the second given equation
$3 x - 3 y = 6$ $3x-3y=6$

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