talayza talayza

24-02-2015
Mathematics

Answered

Solve system by subsubstitution?
14x-2y=46
-7x+y=-23

Answer :

25-02-2015

[tex]14x-2y=46 \\ -7x+y=-23 \\ \\ \hbox{solve the 2nd equation for y:} \\ -7x+y=-23 \\ y=7x-23 \\ \\ \hbox{substitute 7x-23 for y in the 1st equation:} \\ 14x-2(7x-23)=46 \\ 14x-14x+46=46 \\ 14x-14x=46-46 \\ 0=0 \\ \\ \boxed{\hbox{infinitely many solutions}}[/tex]

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