Algebra

find the solutions to the system
y= x^2 + 8x +2
y= 7x +4

A (-2,-10) and (1,11)
B (2,10) and (-1,-11) my answer
C (-2, -34) and (1,11)
D No solutions.

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  1. since y = 7x+4,
    x^2 + 8x + 2 = 7x + 4
    Now just solve for x as usual, and then y = 7x+4

  2. y= x^2 + 8x +2.....(*)
    y= 7x +4.......(**)
    ----------------------------
    Equating *&**

    x²+8x+2=7x+4

    x²+x-2=0
    Factored as
    (x-1)(x+2)=0
    x=1or -2

    Insert those values into
    Y=7x+4
    to find y respectively

    Hmmm none of my x value suit the options

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  3. Forget about my last statement.....did scan through the options properly
    x=1

    y=11

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    2. 👎 0

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