Question 946880
Since we will be substituting, let us first find x. Let us substitute y with 2x-9 in the second equation, since y = 2x-9. It will look like this: {{{x+3(2x-9)=8}}}
Now let's solve the equation.
{{{x+6x-27=8}}}
{{{7x-27=8}}}
{{{7x=35}}}
{{{x=5}}}
Okay, we have x, but wait! We don't have y yet! So let's plug in 5 into x in the first equation to find y.
{{{y=2*5-9}}}
{{{y=10-9}}}
{{{y=1}}}

There we have it! We have that x = 5 and y = 1. Hope I helped! :)