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posledela
3 years ago
9

A) -3 · x = -21 b) -7x + 16 = 2x - 20

Mathematics
2 answers:
scoundrel [369]3 years ago
7 0

Answer:7

Step-by-step explanation:

A) x= -21/-3

= 7 answer

Angelina_Jolie [31]3 years ago
4 0

Answer:

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

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