Jai was solving the system of equations below when something strange happened.   

$y = −2x + 5$
$2y + 4x = 10$

1. Solve the system. What happened?

   Hint (a):

   Use the substitution method and solve for $x$.

   Answer (a):

   $x = ARN$ (All Real Numbers)

2. Graph the two lines on the same set of axes. What happened?

   Hint (b):

   Put the equations in the $y = mx + b$ form.

3. How does your graph in part (b) explain your result in part (a)?

   Hint (c):

   What does the graph show about the points of intersection these lines have?