If 21 more than 3 times a number is -15, what is the number?

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Today at 10:28 AM
Mathematics

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If 21 more than 3 times a number is -15, what is the number?

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Yang100 Yang100 · Answer 1 · 2025-03-24T10:33:38-04:00

Yang100 Yang100

Today at 10:33 AM

Answer:

The number is -12.

Step-by-step explanation:

3x+21=-15

3x=-15-21

3x=-36

x=-36/3

x=-12

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marcthemathtutor marcthemathtutor · Answer 2 · 2025-03-24T10:34:24-04:00

marcthemathtutor marcthemathtutor

Today at 10:34 AM

Answer:

-12

Step-by-step explanation:

let the number be x

"3 times a number" : 3x

"21 more than 3 times a number" : 21 + 3x

"21 more than 3 times a number is -15" : 21 + 3x = -15

Solving this equation:

21 + 3x = -15 (subtract 21 from both sides)

3x = -15 - 21

3x = -36 (divide both sides by 3)

x = -36/3 = - 12

Answer Link