Question 837700
x - first number

y - second number

{{{x=2+3y}}} eq.1 

{{{x+y=30}}} eq.2

substitute:

{{{(2+3y)+y=30}}}
{{{2+4y=30}}}
{{{4y=30-2}}}
{{{4y/4=28/4}}}
{{{y=7}}}

substitute the value of y to eq.1

{{{x=2+3(7)}}}
{{{x=2+21}}}
{{{x=23}}}

{{{highlight (x=23)}}}
{{{highlight (y=7)}}}