Algebra

Which point is a solution of the system?

Y=x-9
X+2y=3

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asked by William
  1. Substitute x-9 from the first equation into the second equation for y to obtain
    x+2(x-9)=3
    x+2x-18=3
    3x=21
    x=7
    Now substitute x=7 into the first equation to evaluate y and you will have the point.
    Post your work if you want us to check it.

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    posted by DrBob222
  2. I still don't completely understand how you got x=7 forgive me for being slow, just never liked math.

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    posted by Chris
  3. OH i get it, ah alright. Now to get y=x-9 i just plug in x=7 right? and would leave me with y= -2 right? and it would look like this

    y=7-9 and y=-2

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    posted by Chris
  4. right.
    So the point is x=7 and y=-2 or (7,-2).

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    posted by DrBob222

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