Mathematics

Question

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

10x + 2y = 30
4x + y = 4

A. x = -11

B. x = 11

C. x = 13

D. x = 15

1 Answer

  • Equation 1) 10x + 2y = 30
    Equation 2) 4x + y = 4

    Multiply all of equation 2 by 2.

    2)  2(4x + y = 4)

    2)  8x + 2y = 8
    1)  10x + 2y = 30

    Subtract equations from each other.

    -2x = -22

    Divide both sides by -2.

    x = -22/-2

    x = 11

    B) x = 11

    ~Hope I helped!~


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