Question 70405
y=x+2
y=-2x+2
{{{ graph( 300, 200, -6, 5, -10, 10, y = x +2, y = -2x +2) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = x +2 and y = -2x +2). 
since y=x+2 then we substitute (x+2) for y in the other equation & solve for x
x+2=-2x+2
x+2x=0
x=0 answer. now substitute 0 for x & solve for y
y=2*0+2
y=2 answer. so we have a solution which is the point (0,2) as show in the graph.