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20 December, 12:11

Solve the following system of equations using substitution.

5y = x - 15

-3y = - 12x - 9

What is the value of x?

(Enter as a fraction)

+1
Answers (1)
  1. 20 December, 12:40
    0
    x - 15 = 5y

    x = 5y + 15

    -3y = - 12 (5y + 15)

    -3y = - 60y - 180

    57y = 180

    y = 60/19 = 3 3/19

    x = 5 (60/19) + 15

    x = 300/19 + 15

    x = 300/19 + 285/19

    x = 585/19 = 30 15/19
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