Question 846985
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
find two points on each line, plot them and connect with corresponding line
y = 2x     x = 0 &#8658; y = 0  {{{ green(P(0,0))}}}   x = 1 &#8658; y = 2  {{{ green(P(1,2))}}}
y = -2x + 8  x = 0 &#8658; y = 8  {{{ red(P(0,8))}}}   x = 1 &#8658; y = 6  {{{ red(P(1,6))}}}
Lines intersect at P(2,4) which is the solution  for this system of Equations
Note: 2x = -2x + 8,  4x = 8 , x = 2 (substituting for x in either EQ &#8658; y = 4)
{{{drawing(300,300,   -10,10,-10,10, 
 grid(1),
red(circle(0, 8,0.4)),
red(circle(1, 6,0.4)),
green(circle(0, 0,0.4)),
green(circle(1, 2,0.4)),
graph( 300, 300, -10,10,-10,10,-2x+8,2x))}}}