211k views
1 vote
If 21 more than 3 times a number is -15 , what is the number?

A: 2
B: -12
C: -2
D: 12

User Oktapodi
by
7.6k points

2 Answers

6 votes

Answer:

-13

Step-by-step explanation:

Rewrite Equation:

(3 · x) + 21 = -15

Subtract 21 From Both Sides:

(3 · x) + 21 - 21 = -15 - 21

Simplify:

3x = -36

Divide Both Sides By 3:


\bold{(3x)/(3) \ = \ (-36)/(3) }

Simplify:

x = -12

Mordancy.

User Oussama Gammoudi
by
8.2k points
1 vote

Let X = the number.

You have 21 more than 3 times the number which is:

3x +21 = -15

Subtract 21 from both sides:

3x = -36

Divide both sides by 3:

x = -36 /3

x = -12

The answer is B.

User Arnab Kundu
by
8.4k points

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