find the values of 'a' for which the equations { ax + y = 7}(adsbygoogle = window.adsbygoogle || []).push({});

{ 4x + ay = 19}

have no solutions.

I realise that you have to split it into

(a 1) (x) (7)

(4 a) (y) = (19)

but I am stuck how to find solutions for 'a'

any help would be great thanks

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