Explain how to subtract -7 - 6 as if you were teaching it to someone else.

If you add a cold cube (add a negative number), the temperature goes down. If you remove a hot cube (subtract a positive number), the temperature goes down. And if you remove a cold cube (subtract a negative number), the temperature goes UP! That is, subtracting a negative is the same as adding a positive.

Step-by-step explanation:

thats the best way I think of at least

{3 + i, 3 - i, 3, -1}

step-by-step explanation:

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x