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Presley Owen
Mathematics
13 June, 17:14
Solve for a in the problem:
-3 (9a+2) = 129
+1
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2
)
Gloria Ferguson
13 June, 17:29
0
Answer: a = - 5
Step-by-step explanation:
-3 (9a+2) = 129
-27a - 6 = 129
-27a = 129+6
-27a = 135
a = - 135/27
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Willow Mercado
13 June, 17:30
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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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