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1 October, 16:24

Solve the system of equation

y=2X^2-3

y=3X-1

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Answers (1)
  1. 1 October, 16:28
    0
    Since they both equal y

    2x^2-3=y=3x-1

    2x^2-3=3x-1

    subtract 3x from both sides and add 1

    2x^2-3x-2=0

    factor

    (x-2) (2x+1) = 0

    set each to zero

    x-2=0

    x=2

    2x+1=0

    2x=-1

    x=-1/2

    subsitute

    y=3x-1

    y=3 (2) - 1

    y=3 (-1/2) - 1

    y=6-1

    y=-3/2-2/2

    y=5

    y=-5/2

    so solutions are

    x=2 and y=5 or

    x=-1/2 and y=-5/2

    (x, y)

    (2,5) or (-1/2, - 5/2)
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