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28 September, 07:59

Solve the system by substitution. In the space provided, type the answer without any

spaces between the letters, numbers, or symbols.

3. x - y = 12

x + y = 18

+3
Answers (1)
  1. 28 September, 11:34
    0
    x=15, y=3

    Step-by-step explanation:

    x-y=12

    x+y=18

    now, x=12+y

    substituting in x+y=18

    (12+y) + y=18

    12+2y=18

    2y=18-12

    2y=6

    y=6/2

    y=3

    now, x=12+y

    so, x=12+3

    x=15
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