anonymous
  • anonymous
I am working on solving the system of equations by graphing. I am having some problems so I hope someone can show me an easier way of doing this. This is what I have x-3y=-3 & x+3y=9.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
solve each equation for one of the two variables you have as: x-3y=-3 will be x=3y-3. (1) x+3y=9 will be x=9-xy (2) find any two points in each function, and connect them with a line. the intersection point is your solution.. I hope that would help
anonymous
  • anonymous
the second equation is x=9-3y.. sorry for the typo!!
anonymous
  • anonymous
That is were I am running into problems. I think I am getting the first one. Here is what I have so far. 1st equation: x-3y=-3. I got y=1/3x-3/3(1) x=3 and y=1 2nd equation: x+3y=9. I got y=-1/3x+9/3(3) x=9 and y=3 The problem I am having is figuring out the second point to draw the line.

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anonymous
  • anonymous
Can you show me something that will work on all the equations?
anonymous
  • anonymous
take any value of x and find the corespondent value of y.. this is a new point
anonymous
  • anonymous
so just pick any number for x to solvethe equation?
anonymous
  • anonymous
well is it okay if we work in my equations.. it looks much simpler. you know how I got them anyway?
anonymous
  • anonymous
so is my work right so far?
anonymous
  • anonymous
I didn't check it.. let me
anonymous
  • anonymous
yes please do.
anonymous
  • anonymous
hmm I don't think you're following the right method.. you're asked to solve them by graphing.. so find any two points in the line and coonnect them. do this to both lines, just find where they intersect and you're done.
anonymous
  • anonymous
to get points.. just substitute any value for x, get the corespondent value of y.. this is a point
anonymous
  • anonymous
Ok but I never worked i you way. They are showing us theway I put I wrote it. So now I am kind of confused.
anonymous
  • anonymous
should be worked it your way.
anonymous
  • anonymous
watch this.. it may help
anonymous
  • anonymous
I will do your problem the way that's usually done by steps: 1) solve both equations for y: 1st equation: \[y={1 \over 3}x+1\rightarrow (1)\] 2nd equation: \[y={-1 \over 3}x+3 \rightarrow(2)\]
anonymous
  • anonymous
please check my steps!! :)
anonymous
  • anonymous
2) find two points for each equation (intersection points are usually preferred): 1st for equation (1): \[x=0 \implies y=1, x=3 \implies y=2\] so we have the two points in the first line which are (0,1) and (3,2)
anonymous
  • anonymous
for equation (2): \[x=0 \implies y=3, x=3 \implies y=2\] we have two points in the second line, which are (0,3) and (3,2)
anonymous
  • anonymous
3) draw the line of each equation by connecting the two pints in each one
anonymous
  • anonymous
4) find the point they intersect at (x,y), this point is the solution of the linear system!! :)
anonymous
  • anonymous
I guess that was confusing to you, but you should have said thanks :P
anonymous
  • anonymous
sorry had to go help the wife fix supper. Will look it over closely and use to try my next problem and see if I get it right. Thank you very much for your help.

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