4 years ago

A number a decreased by 7 is 2.

Mathematics

2 answers:

umka21 [38]4 years ago

7 0

Answer:

Step-by-step explanation:

Let's first convert this to numbers. When a number is decreased by a certain amount, that is the same as saying that something is subtracted from it. Therefore:

a-7=2

Add 7 to both sides:

a-7+7=2+7

a=9

Hope this helps!

Minchanka [31]4 years ago

5 0

Answer:

Step-by-step explanation:

If a number (Let's call it x) has been subtracted by 7 (x - 7) then to find the previous number you just do the opposite. Let's call the end result y. 2 + 7 = x (Or y + 7 = x). 2 + 7 = 9.

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