Ask Question
31 January, 12:27

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

A.-1/7

B.-7/9

C.-8/7

D.-9

E.-4/3

+3
Answers (1)
  1. 31 January, 12:34
    0
    Multiply 2nd equaton 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
Know the Answer?