A) - 3 · x = - 21

b) - 7x + 16 = 2x - 20

Question

Noe Santos

Mathematics

8 October, 18:37

A) - 3 · x = - 21

b) - 7x + 16 = 2x - 20

+4

Answers (2)

Know the Answer?

Tito · Answer 1

Answer:7

Step-by-step explanation:

A) x = - 21/-3

= 7 answer

Marshall Graham · Answer 2

Step-by-step explanation:

a) - 3x = - 21

Divide both sides by (-3)

-3x/-3 = - 21/-3

x = 7

b) - 7x + 16 = 2x - 20

Subtract 16 from both sides

-7x + 16 - 16 = 2x - 20 - 16

-7x = 2x - 36

Subtract 2x from both sides

-7x - 2x = 2x - 36 - 2x

-9x = - 36

Divide both sides by (-9)

-9x/-9 = - 36/-9

x = 4

A) - 3 · x = - 21b) - 7x + 16 = 2x - 20

A) - 3 · x = - 21

b) - 7x + 16 = 2x - 20