Question 180598
1.{{{y=2x}}}
2.{{{x+y=12}}}
Directly substitute eq. 1 into eq. 2 and solve for x.
2.{{{x+y=12}}}
{{{x+(2x)=12}}}
{{{3x=12}}}
{{{highlight(x=4)}}}
Now use either equation to solve for y. Eq. 1 is quickest.
1.{{{y=2x}}}
{{{y=2(4)}}}
{{{highlight(y=8)}}}