Question 310092
2x+y=0
y=-2x (RED LINE)
y=3x+5 (GREEN LINE)
{{{ graph( 300, 200, -6, 5, -10, 10, y = -2x, 3x +5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = -2x and 3x +5). 
-2x=3x+5
-2x-3x=5
-5x=5
x=5/-5
x=-1 ans.
y=-2*-1
y=2 ans.
Answer (-1,2)