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25 February, 17:46

4x - 9y = - 21

- 4x - 3y = 9

+3
Answers (1)
  1. 25 February, 17:52
    0
    (-3,1)

    y = 1

    x = - 3

    Step-by-step explanation:

    4x-9y=-21

    -4x-3y=9

    solve the equation

    4x=-21+9y

    -4x-3y=9

    substitute the value of 4x onto an equation

    -1 (-21+9y) - 3y=9

    multiply - 1 to the numbers in parenthesis

    -21+-9-3y=9

    add - 9 to 9 and put the negative on nine as a positive.

    -21-3y=18

    add - 21 to 18 but since 21 is a negative the equation is subtraction.

    -3y=-3

    divide Both sides by - 3

    y=1

    substitute the value of y into an equation

    -4x-3•1=9

    multiply 3 to 1

    -4x-3=9

    put - 3 as a positive and add 3 to 9

    -4x=12

    divide both sides by - 4

    x = - 3

    (-3,1)
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