solve each system by graphing method

Question

Solve each system by graphing

 

1. x-y=4

   2x+y=5

 

2.  2x+y=1

    x-2y=-7

 

3.  5/2 x+y= 1/2

    2x-3/2 y=5

 

 

Answer 1

Do what it says...graph each pair of lines, carefully. If they intersect at a point (x,y), that's the solution.

If the two lines are parallel, NO SOLUTION. If the two equations really only represent one distinct line, then that line is the solution (infinitely many points!).