SOLUTION: Solve the system of equations by graphing. What is the solution? x+4y=12 y= -x

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Question 73407: Solve the system of equations by graphing. What is the solution?
x+4y=12
y= -x

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the 1st equation for y
x%2B4y=12
y=3-%281%2F4%29x
Now graph the 2 equations
graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+3-%281%2F4%29x%2C+-x%29+Graphs of y=3-(1/4)x and y=-x
The solution is the intersection in the form of (x,y). So if we only had the graph we could estimate the solution to be about (-4,4). I'm just looking at the graph and guessing where they intersect, this intersection is the solution.