How to rearrange this equation?

Rearrange Margin = (Selling Price - Cost)/ Selling Price to make Selling price the subject

I'm a bit stuck... How do you rearrange v/3x = w/y to make x the subject? Thanks

Another one 61/3 minus 5 1/4

Help me solve the equation pleaseee 4t^2+19=19

Are you smart enuff?? [ eight and two thirds plus six and two thirds ]

If you can help me that would be nice. I'm really have a difficult time, I understand the information but I can't write out w...

Alrighty. Here's my first question: -3x + b = 6x Please show me STEP BY STEP! How to do this.

A theater sold a total of 220 tickets. Some of them sold for $6 each and the rest sold for $3 each. The total amount collecte...

Help please!!! I have no idea. First set of questions say; factorise the expressions, each has 4 as a common factor 4x +8 12-...

Write the equation for a specific line a.slope=4, y-intercept=-3 b.slope= -1 and contains (2, -9) c. contains (3, -1) and (6,...