3x - 5y = 60 4x + 5y = - 4?

12 Answers

Relevance
  • 1 month ago

    3x - 5y = 60 .. eq1

    4x + 5y = - 4 .. eq2

    ---------------------

    7x = 56

     x = 8  answer// 

    plug in x = 8 to eq1

    3x - 5y = 60

    3(8) - 5y = 60

    24 - 5y = 60

     - 5y = 60 - 24

     - 5y = 36

     y = - 36/5 answer//

  • 1 month ago

    3x-5y=60

    4x+5y=- 4

    add

    7x=56>>>x=8

    24-5y=36>>>y= - 36/5

    32+5y= - 4

    5y= - 4- 32=-36>>y= - 36/5  ok

  • 1 month ago

    3x - 5y = 60 -------------1

    4x + 5y = - 4--------------2

    Adding the above equations, we get

    7x = 56

    or x = 8

    Equation 2 is 4x + 5y = - 4

    So,

    5y = - 4 – 32

    y = -7.2

  • 1 month ago

    You can just type this system into WolframAlpha and get the answer.

    Or you could do it yourself. Given that you have -5y and 5y, you can add the equations and eliminate y as a variable. That leaves:

    7x = 56

    x = 56/7

    x = 8

    Then plug that into either equation to get y.

    Answer:

    x = 8

    y = -36/5 (or -7.2)

  • How do you think about the answers? You can sign in to vote the answer.
  • David
    Lv 7
    1 month ago

    The solutions to the given simultaneous equations are x = 8 and y = -7.2

  • 1 month ago

    3x - 5y  = 60, 4x + 5y =  -4

    x = 8, y = -36/5

  • Ian H
    Lv 7
    1 month ago

    3x - 5y = 60

    4x + 5y = - 4

    7x = 56, x = 8

    5y = - 4 – 32

    y = -7.2

  • 1 month ago

    (1) : 3x - 5y = 60

    (2) : 4x + 5y = - 4

    You calculate (1) + (2):

    (3x - 5y) + (4x + 5y) = 60 + (- 4)

    3x - 5y + 4x + 5y = 60 - 4

    7x = 56

    x = 8

    Recall (1):

    3x - 5y = 60

    24 - 5y = 60

    5y = 24 - 60

    5y = - 36

    y = - 36/5

  • 1 month ago

    Add the two equations, you get 7x = 56, so x = 8,

    and then 24 - 5y = 60, so 5y = -36 and y = -7.2

  • 1 month ago

    add two equation 3x-5y+4x+5y=60-4

    7x=56

    x=56/7

    x=8

    put the value on equation 1

    3*8-5y=60

    24-5y=60

    -5y=36

    y=-36/5

Still have questions? Get your answers by asking now.