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I'm trying to help my son with this work but I don't understand it can anyone please help me with these answers

Im trying to help my son with this work but I dont understand it can anyone please help me with these answers class=

Respuesta :

CeciliaHampton
On #9, it gives you the y value. So plug it into the equation. 

5x+3(4)=7
5x+12=7
Subtract 12 from both sides.
5x=-5
Divide both sides by 5.
X=-1.

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