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19 April, 22:45

Which value of x satisfies both - 9x + 4y = 8 and - 3x - y = 4?

a.-1/7

b.-7/9

c.-8/7

d.-9

e.-4/3

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Answers (1)
  1. 20 April, 00:23
    0
    Cancel y values

    multiply 2nd equation by 4 and add to first

    -9x+4y=8

    -12x-4y=16 +

    -21x+0y=24

    -21x=24

    divide both sides by - 21

    x=24/-21

    x=-8/7

    C is answer
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