Question

1/2x=15

Answer 1

Multiply both sides by 2.

Answer 2

And you're done.

Answer 3

why 2?

Answer 4

OK, let's think of it this way: divide both sides by \(\large {1 \over 2}\).

Answer 5

and what do u mean multiply?

Answer 6

Multiplication... is... the... basic... thing... they... teach... you... in... multiplication... tables.

Answer 7

Remember this?
2 x 1 = 2
2 x 2 = 4
2 x 3 = 6
2 x 4 = 8
2 x 5 = 10
2 x 6 = 12

Answer 8

Basically, you just wanna get the \(\rm x\) alone.

Answer 9

i'm sorry why do we multiply 2 to both sides is what i meant ;)

Answer 10

Think of it this way: we must divide both sides by \(\Large {1 \over 2}\) which just means multiplying 2. Right?

Answer 11

yes

Answer 12

we multiply x by 2?

Answer 13

Both sides.

Answer 14

can u demonstrate?

Answer 15

\[\rm {1 \over 2}x\cdot 2 = {15 \cdot 2} \]

Answer 16

then the answer will be?

Answer 17

\[15 \cdot 2\]

Answer 18

ok..so WHAT IF 1/2x is equals to 3..and it will look like 3/2=30?

Answer 19

What do mean if (1/2)x = 3?
You multiplied by 2 in order to isolate the x...to let it alone on one side. So:
\[x = 15 \times 2\]

Answer 20

why do we multiply it with 2 then?

Answer 21

As said above, we divide by one-half which is the same as multiplying 2.

Answer 22

To UNDO the (1/2)x we multiply by 2.

We want to solve for x, find it's value. So we need it isolated on one side.

Answer 23

Once you multiply by 2, the (1/2) is gone.