## AmberCat21 1/2x=15 one year ago one year ago

1. ParthKohli

Multiply both sides by 2.

2. ParthKohli

And you're done.

3. AmberCat21

why 2?

4. ParthKohli

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

5. AmberCat21

and what do u mean multiply?

6. ParthKohli

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

7. ParthKohli

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

8. ParthKohli

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

9. AmberCat21

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

10. ParthKohli

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

11. AmberCat21

yes

12. AmberCat21

we multiply x by 2?

13. ParthKohli

Both sides.

14. AmberCat21

can u demonstrate?

15. ParthKohli

$\rm {1 \over 2}x\cdot 2 = {15 \cdot 2}$

16. AmberCat21

17. ParthKohli

$15 \cdot 2$

18. AmberCat21

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

19. jazy

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: $x = 15 \times 2$

20. AmberCat21

why do we multiply it with 2 then?

21. ParthKohli

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

22. jazy

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.

23. jazy

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