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3 years ago

Solve for a in the problem: -3(9a+2)=129

Mathematics

2 answers:

anyanavicka [17]3 years ago

8 0

Answer: a = -5

Step-by-step explanation:

-3 (9a+2)=129

-27a -6 = 129

-27a = 129+6

-27a = 135

a = -135/27

Yuliya22 [10]3 years ago

8 0

Answer:

a= -5

Step-by-step explanation:

To solve the equation, we want to find out what a is. In order to do this, we have to get a by itself. Perform the opposite of what is being done to the equation. Keep in mind, everything done to one side, has to be done to the other.

-3(9a+2)=129

-3 is being multiplied by 9a+2. The opposite of multiplication is division, so divide both sides by -3.

-3(9a+2)/-3=129/-3

9a+2=129/-3

9a+2=-43

2 is being added on to 9a. The opposite of addition is subtraction, so subtract 2 from both sides.

9a+2-2= -43-2

9a= -43-2

9a= -45

a is being multiplied by 9. The opposite of multiplication is division, so divide both sides by 9.

9a/9= -45/9

a= -45/9

a=-5

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