SAT Subject Test Mathematics Level 2

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

Before you can cross multiply, you need to express the right side of the equation as a single fraction.
That means giving the two fractions a common denominator and adding them. The common
denominator is 2m.

Now you can cross multiply:

1. If    ,  what    is  the value   of  m?

(A) −3.464

(B) −1.978

(C) −0.918

(D) 1.978

(E) 3.464