SOLUTION: I am trying to help my daughter with her Algebra and it has been a very long time since I have done any of this. She needs to solve the system of equations by graphing: y=-

Algebra ->  Graphs -> SOLUTION: I am trying to help my daughter with her Algebra and it has been a very long time since I have done any of this. She needs to solve the system of equations by graphing: y=-      Log On


   

Question 807805: I am trying to help my daughter with her Algebra and it has been a very long time since I have done any of this.
She needs to solve the system of equations by graphing:
y=-x-3y
y=x+1
Thank you for your help.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
solve the system of equations by graphing:
Assume you mean
y= -x - 3
y = x + 1
:
Find a set of x/y pairs for the 1st equation: y = -x - 3
For example on the first eq: when x = 2: y = -2 -3; = -5
Do the same for each value of x
A table
x | y
------
-4 | +1
-3 | 0
-2 | -1
0 | -3
+2 | -5
Make table for the 2nd equation y = x + 1
x | y
-------
-4 |-3
-3 |-2
-2 |-1
0 |+1
+2 |+3
:
Plot these using at least two points from the table on the same graph
should look like this
+graph%28+300%2C+300%2C+-6%2C+5%2C+-5%2C+5%2C+-x-3%2Cx%2B1%29+
The solution is where the two graphs intersect where
x=-2, y= -1, you can see this on the tables too