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1. Which expression is equivalent to the expression shown
below? 20 + 8y – 9y – 21
A. 2(10 + 4y – 7y - 19)
B. 2(10 + 4y) – 3(3y - 7)
C. 4(5 + 2y – 5y - 17)
D. 4(5 + 2y) – 3(3y + 7)
E. -(y + 1)
F. -(1- y)
G. y - 1

Respuesta :

mhanifa

Answer:

  • D and E

Step-by-step explanation:

There are two kinds of expressions in the choices:

  • factored and simplified

Let's find the equivalent expression:

  • 20 + 8y - 9y - 21

Factored one:

  • 20 + 8y - 9y - 21 =
  • 4(5 + 2y) - 3(3y + 7)

The matching choice is D

Simplified:

  • 20 + 8y - 9y - 21 =
  • 20 - 21 + 8y - 9y =
  • - y - 1 =
  • - (y + 1)

The matching choice is E

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