Question

Write a paragraph proving that x=8 in the equation 7x-28=28

Answer 1

[see below]

Explanation:

We would need to undo the equation and preform inverse operations to get 'x' on one side. First, we need to get rid of 28 by adding 28 to each side. This would leave us with 7x on one side. Then, we wound divide each side by 7. This would leave us with 'x = 8'. If we plugged in the value, then it would satisfy the equation.

`7x-28=28\\\\7x-28+28=28+28\\\\7x=56\\\\(7x=56)/(7)\\\\ \boxed{x=8}`

Checking the answer:

`7(8)-28=28\\\\56-28=28\\\\\boxed{28=28}`

Hope this helps.