Problem Solving

I have to solve this for Y. Here are the steps that I took where did I go wrong.

100-y=100,000/(100+x)
Subtract 100 from both sides

-y=100,000/(100+x)-100

multiply both sides by -1
y=-100,000/(100+x)+100

The anser given is
y=100-[100,000/(100+x)]

Are these the same things if this were so then

7-6
would eauly
-7+6 which it does not

Where am I going wrong

Jinglander wrote:I have to solve this for Y. Here are the steps that I took where did I go wrong.

100-y=100,000/(100+x)
Subtract 100 from both sides

-y=100,000/(100+x)-100

multiply both sides by -1
y=-100,000/(100+x)+100

The anser given is
y=100-[100,000/(100+x)]

Are these the same things if this were so then

7-6
would eauly
-7+6 which it does not

Where am I going wrong

The part in Bold is your mistake.
a-b When multiplied by -1 becomes b-a
Hence,
-100,000/(100+x)-100 when multiplied by -1 becomes
100-100,000/(100+x)


Hope this helps!!

b-a
is the same as -b+a still dont see the error

Jinglander wrote:b-a
is the same as -b+a still dont see the error

-b+a is equal to a-b
It is different from b-a

A = B-C
When you multiply both sides by -1,
-1 * A = (-1)*B - (-1)*C
-A = -B-(-C)
-A = -B+C
-A = C-B

Hope this helps!!