Question 170330
{{{x + y = -4}}}, EQN 1
{{{y = -3x + 2}}}, EQN 2
In EQN 1, we get {{{y=-x-4}}}, EQN 3 ---> subst. in EQN 2
{{{-x-4=-3x+2}}}, combine similar terms
{{{-x+3x=2+4}}}
{{{2x=6}}} ----> {{{cross(2)x/cross(2)=cross(6)3/cross(2)}}}
{{{highlight(x=3)}}}, 
Subst. in EQN 1
{{{3+y=-4}}}
{{{y=-4-3=highlight(-7=y)}}}
See graph
{{{drawing(300,300,-8,8,-8,8,grid(1),graph(300,300,-8,8,-8,8,-x-4,-3x+2),blue(circle(3,-7,.15)))}}} ---> see point of intersection (3,-7)
.
Thank you,
Jojo