Question

Explain how to isolate the variable in the equation
2n + 7 = 15. Lesson 6-2

Answer 1

n = 4

Explanation:

1. Subtract 7 from both sides

2n + 7 = 15

-7 -7

2. Your left with 2n = 8

---TO ISOLATE THE VARIABLE---...

Divide 8 by 2n

`(2n)/(2n)=(8)/(2n)`

n = 4

Answer 2

N = 4

Explanation:

In the equation 2n + 7 = 15, we have to isolate the variable. But, before that, we have to get rid of anything else. Like the +7 in the equation. So we can subtract from each side.

2n + 7 = 15

Take out the +7 by subtracting 7 on both sides.

2n + 7 - 7 = 15 - 7

2n = 8

Now, to get rid of the 2 next to the n, we have to divide both sides by 2

2n/2 = 8/2

n=4