Answer :
[tex]y=x+7\implies 2x=y-10=(x+7)-10\implies x=-3[/tex]
Plug this into either equation (I'll use the second) to find [tex]y[/tex].
[tex]y=-3+7=4[/tex]
Plug this into either equation (I'll use the second) to find [tex]y[/tex].
[tex]y=-3+7=4[/tex]