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algebra uno help + check?

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So, I've got these other sets of problems, that are telling me to write equivilant equations for the equations given, heres what I think.

1) x+y=-10
-5+5=10
-5(2)+10

2) 5x+10y=15
5x(3)=15
5x+10=15

3)-x+2y=9
y=3(3)=9
3+6=9


Heres what I need YOU tutors to help me with:

Could you tell me if my answers are correct, if not explain why?

Thank you.

  • algebra uno help + check? -

    I think you are totally wrong.

    Take the last one.

    -x+2y=9
    here are some equivalent equations:
    2y-9=x
    x+9=2y
    14y=63+7x

    Equivalent equations are equations that have the same solution.

  • algebra uno help + check? -

    Okay, thank you.

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