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15 September, 15:37

I don't know how to do this

Y=x-7

3x-3y=21

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Answers (1)
  1. 15 September, 19:23
    0
    You're going to use the substitution method for this.

    First, we know that Y = x-7, so we can plug x-7 into everywhere we see Y!

    3x - 3 (x - 7) = 21

    then we simplify

    3x - 3x + 21 = 21

    ^ ^

    These cancel out!

    So we're left with ...

    21 = 21

    That means that the solution to this equation is all real numbers!
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