SAT Subject Test Mathematics Level 1

UNKNOWN IN A DENOMINATOR

The basic procedure for solving an equation is the same even when the
unknown is in a denominator: Do the same thing to both sides. In this case
you multiply in order to undo division.

If you wanted to solve you would multiply both sides by x:

Now you have an equation with no denominators, which is easy to solve:

Another good way to solve an equation with the unknown in the denominator
is to cross multiply. That’s the best way to do Example 6.

Example 6

1. If       what    is  the value   of  x?

(A)