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3 May, 18:16

4x+y=210 and 3x+2y=195

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Answers (2)
  1. 3 May, 20:45
    0
    Subsitution

    4x+y=210

    minus 4x both sides

    y=210-4x

    sub 210-4x for y in other equation

    3x+2 (210-4x) = 195

    3x+420-8x=195

    -5x+420=195

    minus 420 both sides

    -5x=-225

    divide both sides by - 5

    x=45

    sub back

    y=210-4x

    y=210-4 (45)

    y=210-180

    y=30

    x=45

    y=30

    (x, y)

    (45,30)
  2. 3 May, 21:01
    0
    Multiply first equations by - 2 to use elimination method.

    -8x-2y=-420

    3x+2y=195

    -5x=-225

    x=45

    Plug this value of x in.

    3 (45) + 2y=195

    135+2y=195

    2y=60

    y=30

    Final answer: (45,30)
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