substitution

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solve by the substitution method

3x+5y=21
x=51-9y

  • substitution -

    substitute x in the eq 3x+5y=21
    3(51-9y)+5y=21
    153-27y+5y=21
    153-22y=21
    -22y=21-153
    -22y=-132
    -22y/-22=-153/-22
    y=6

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