Mathematics

Question

Solve the system of equations and choose the correct answer from the list of options.

x – y = 7
y = 3x + 12

2 Answer

  • x-y=7
    y=3x+12
    y-3x=12
    +
    -y+x=7
    =
    -2x=19
    x=-9.5
    y=-16.6. Hope it help!
  • Answer: x=-9.5

    y=-16.5

    Step-by-step explanation:

    Hi, to solve this problem we have to apply the substitution method:

    x-y =7 (a)

    y=3x+12(b)

    Replacing the value of "y" in (a) for (b):

    x -(3x+12)=7

    x-3x-12=7

    x-3x =7+12

    -2x =19

    x=19/-2

    x=-9.5

    Replacing the value of "x" in (b)

    y=3x+12

    y=3(-9.5)+12

    y= -28.5+12

    y=-16.5

    Feel free to ask for more if needed or if you did not understand something.

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