Respuesta :

mhanifa

Answer:

  • See below

Step-by-step explanation:

1)

x + 5 = 12, subtract 5 from both sides

x = 7

Subtraction property of equality

  • a = b
  • a - c = b - c

2)

x + y = 20 and y = 5, substitute 5 into first equation

x + 5 = 20

Substitution property of equality

  • a + b = c and b = d
  • a + d = c

3)

2x - 3 = 11, interchange the sides of equality

11 = 2x - 3

Symmetric property of equality

  • a = b
  • b = a
msm555

Answer:

1. if x + 5 = 12, then x = 7

:Subtraction property of equality

2. If x + y = 20, and y = 5, then x + 5 = 20.

:Substitution property of equality

3. If 2x3 = 11, then 11 = 2x - 3.

:Symmetric property of equality

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