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# re-arranging formula watch

1. can someone help me with this? the question is...

"if a = bx
b= ...x = ..."

then theres a second part which is...
"If a = 10 and b = 5, x =..."

does anyone know the answer or just how to do it?!?!
2. So what we have here is basically an equation that says what number do I multiply 5 by to get 10. The answer is 2 so x=2. However a more mathematical way of doing this is to say if we have a=bx and b=5 and a=10. We can out these number in place o the a and b.
So we now have 10=5x
Now what we do is solve for x so we want to leave x on its own on the right hand side of the equation. So if we divide both sides of the equation by 5
10/5=2 so the left hand side becomes 2
And if we divide 5x by 5 we get x.
So now the equation becomes 2=x
So x=2.

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Updated: September 13, 2015
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