SOLUTION: find points on graph using the equation -x+2y=11 how do you find the point for the graph

Algebra ->  Linear-equations -> SOLUTION: find points on graph using the equation -x+2y=11 how do you find the point for the graph      Log On


   

Question 75372: find points on graph using the equation -x+2y=11
how do you find the point for the graph
Found 2 solutions by rmromero, checkley75:
Answer by rmromero(383) About Me  (Show Source):
You can put this solution on YOUR website!


find points on graph using the equation -x+2y=11 

how do you find the point for the graph







Just assume values of x then substitute them to the eqution -x + 2y = 11



If x = -1                  if x = 1



    -(-1) + 2y = 11        -(1) + 2y = 11

       1 + 2y = 11           -1 + 2y = 11

           2y = 10                2y = 12

            y = 5                  y = 6



You have two points (-1,5) and (1,6) now so you can now graph the equation.

Plot the two points then connect with a line



Note: you can assume as many as you can though two points can determine 

      the graph of this equation.



graph+%28200%2C+200%2C+-3%2C+7%2C+-1%2C+12%2C+%281%2F2%29x+%2B+11%2F2%29



    



Visit my website

http://onlinemathtutorial.tripod.com

Sign my guestbook

Thanks

Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
-x+2y=11
2y=x+11
y=x/2+11/2 the y intercept is (0,11/2) or (0,5.5)
setting y=0 we solcve for x thus:
0=x/2+11/2
x/2=-11/2 now cross multiply thus:
2x=-22
x=-22/2
x=-11 or (-11,0) is a second point.
+graph%28+300%2C+300%2C+-12%2C+12%2C+-10%2C+10%2C+y+=+x%2F2+%2B11%2F2%29+ (graph 300x300 pixels, x from -12 to 12, y from -10 to 10, y = x/2 +11/2).