# 5.5 = -2 + d what's the value of d? I dont know if I should add or subtract 2 because it is a negative number.

QUESTION POSTED AT 18/04/2020 - 07:38 PM

QUESTION POSTED AT 18/04/2020 - 07:38 PM

The value of *d* is **7.5**.

The key to solving equations is doing the inverse, or opposite, function/process.

For example, you subtract when d + 1 = 2:

d + 1 = 2

(d + 1) -1 = (2) - 1

d = 1

In the same way, you add values when you have a negative:

5.5 = -2 + d = d - 2

5.5 = d - 2

(5.5) + 2 = (d - 2) + 2

7.5 = d

Now if instead of adding 2, you subtract 2, the problem becomes:

5.5 = d - 2

(5.5) - 2 = (d - 2) - 2

3.5 = d - 4

This doesn't solve your problem, it just makes the value needed to be canceled out larger.

Thus d =**7.5 **and you will **add** because the value is negative.

The key to solving equations is doing the inverse, or opposite, function/process.

For example, you subtract when d + 1 = 2:

d + 1 = 2

(d + 1) -1 = (2) - 1

d = 1

In the same way, you add values when you have a negative:

5.5 = -2 + d = d - 2

5.5 = d - 2

(5.5) + 2 = (d - 2) + 2

7.5 = d

Now if instead of adding 2, you subtract 2, the problem becomes:

5.5 = d - 2

(5.5) - 2 = (d - 2) - 2

3.5 = d - 4

This doesn't solve your problem, it just makes the value needed to be canceled out larger.

Thus d =

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