Question 157598
7x-3y=6; x=3
substitute {{{x=3}}}:
{{{7*3-3y=6}}}, transpose
{{{21-6=3y}}}
{{{15=3y}}} --------> {{{cross(15)3/cross(3)=cross(3)y/cross(3)}}}
{{{y=5}}}
check it out when {{{system(x=3,y=5)}}}
{{{(7*3)-(3*5)=6}}}
{{{21-15=6}}}
{{{6=6}}}
Thank you,
Jojo