Mathematics

Mathematics, 16.10.2020 15:01, valenzueladomipay09u

Can someone please explain to me where my teacher got the -3x - 15y = -135 from? I understand how to do this but I have no idea how she got those numbers.

Can someone please explain to me where my teacher got the -3x - 15y = -135 from? I understand how t

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Can someone please explain to me where my teacher got the -3x - 15y = -135 from? I understand how to...

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