Question 626527
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
finding two ordered pairs (x,y) for each line:
x+y=1 &#8658; (0,1) and (1,0) on this line (green)
y=2x+13 &#8658; (0,13) and (-13/2,0) on this line (blue)
plot points and connect with their respective lines
Intersect at (-4,5), the ordered pair that is the solution for this system
{{{drawing(300,300,   -10,10,-10,15,  
 grid(1),
circle(-4, 5,0.4),
circle(1, 0,0.4),
circle(0, 1,0.4),
circle(0, 13,0.4),
circle(-13/2, 0,0.4),
graph( 300, 300, -10,10,-10,15,0,-x+1, 2x+13))}}}