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Algebra

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Which point is a solution of the system?

Y=x-9
X+2y=3

  • Algebra -

    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.

  • Algebra -

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

  • Algebra -

    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

  • Algebra -

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

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