Question 301745
1.{{{x+y=9}}}
2.{{{y=x+1}}}
Use eq. 2 directly in eq. 1 and solve for x. 
{{{x+(x+1)=9}}}
{{{2x+1=9}}}
{{{2x=8}}}
{{{highlight_green( x=4)}}}
Now use either equation to solve for y.
{{{y=x+1}}}
{{{y=4+1}}}
{{{highlight_green(y=5)}}}