Question 347108
1.{{{7x+y=0}}}
2.{{{2x-y=9}}}
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From eq. 2,
{{{y=2x-9}}}
Substitute into eq. 1,
{{{7x+(2x-9)=0}}}
{{{9x-9=0}}}
{{{9x=9}}}
{{{highlight(x=1)}}}