Question

Solve 15+4a=7a
what is a

Answer 1

Answer:5

Explanation:

Answer 2

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Answer:
`\textsf{a = 5}`

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Given:
`\textsf{15 + 4a = 7a}`

Find:
`\textsf{Determine the value of the variable, a}`

Solution: In order to solve this problem we need to have all of the variables on one side and the constant on the other side. In this case, we need to initially subtract 4a from both sides to isolate 15 by itself.

• 
  `\textsf{15 + 4a - 4a = 7a - 4a}`
• 
  `\textsf{15 = 7a - 4a}`
• 
  `\textsf{15 = 3a}`

Now that we have combined like terms, we now need to isolate the variable a to be by itself so we can capture what the value of it is. We can do this by dividing both sides by 3 which gives us just a on the right-hand side.

• 
  `\textsf{15 / 3 = 3a / 3}`
• 
  `\textsf{15 / 3 = a}`
• 
  `\textsf{5 = a}`

Therefore, now that we have isolated the variable a, we can tell that the value of it is 5.