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19 September, 01:22

Solve the following systems of equations with substitution and give the solution.

b.

y = x + 15

y = 2x

(?,?)

c.

y = 4x + 45

x = 4y

(?,?)

+5
Answers (1)
  1. 19 September, 01:34
    0
    B.

    y = x+15

    Therefore x+15 = 2x

    x = 15

    y = 15+15=30

    (x, y) = (15,30)

    c.

    x = 4y

    x = 4 (4x+45)

    x = 16x + 180

    15x = - 180

    x = - 12

    y = - 12/4 = - 3

    (x, y) = (-12,-3)
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