Question 165491
{{{y=x-7}}}---> EQN 1
{{{x+y=3}}}---> EQN 2
Combine similar terms in EQN 1 then add to EQN 2:
{{{y-cross(x)=-7}}}
{{{cross(x)+y=3}}}
={{{2y=-4}}} -----> {{{cross(2)y/cross(2)=-cross(4)2/cross(2)}}}
={{{highlight(y=-2)}}}
For x:
via EQN 1: {{{-2=x-7}}} ---> {{{-2+7=x}}} ---> {{{highlight(x=5)}}}
See graph:
{{{drawing(300,300,-8,8,-8,8,grid(1),graph(300,300,-8,8,-8,8,x-7,3-x),circle(5,-2,.20))}}}--- see both lines interesect at points(5,-2)
*Remember: green line ---> {{{x+y=3}}}
Red line ----> {{{y=x-7}}}
Thank you,
Jojo