Mathematics

Question

Use substitution to solve for y in the system of equations.

5x + y = 6
3x - 3y = 18


A. y = -4

B. y = 8

C. y = 16

D. y = 2


2 Answer

  • a -4 is the answer i am for sure i am right
  • Equation 1: 5x + y = 6
    Equation 2: 3x - 3y = 18

    Multiply all of equation 1 by 3.

    1)  3(5x+y=6)

    1)  15x + 3y = 18
    2)  3x - 3y = 18

    Add equations together.

    18x = 36

    Divide both sides by 18.

    x = 2

    Plug in 2 for x in first equation.

    5x + y = 6

    5(2) + y = 6

    10 + y = 6

    Subtract 10 from both sides.

    y = 6 - 10

    y = -4

    So, your answer is a) -4

    ~Hope I helped!~
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