SOLUTION: I need to figure out how to find solution pairs so that I can turn them into points so I can graph them. Here is an example: y=-3x I tried the method substitute 0 for x and sol

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: I need to figure out how to find solution pairs so that I can turn them into points so I can graph them. Here is an example: y=-3x I tried the method substitute 0 for x and sol      Log On


   

Question 437302: I need to figure out how to find solution pairs so that I can turn them into points so I can graph them.
Here is an example: y=-3x
I tried the method substitute 0 for x and solve for y then substitute 0 for y and solve for x.
I don't understand this though
Found 2 solutions by richard1234, rwm:
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
You substitute 0 for x, like this:

y = -3(0)

Then solve for y. You will get y = 0, so the ordered pair (0,0) lies on the line.

We won't substitute 0 for y, since we will actually obtain the same ordered pair. We can substitute x = 1, since x is our independent variable and the function is defined everywhere. If we substitute x = 1, y = -3(1) = -3, so (1, -3) is also on the line.

We can connect the two points together and draw a line:

graph%28200%2C200%2C-5%2C5%2C-5%2C5%2C-3x%29

Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
If x=0 then y=0 (0,0)
if x=1 then y =-3 (1,-3)
if x=-1 then y=3 (-1,3)