Algebra: A Combined Approach (4th Edition)

Substitute 3, -6, and -9 for x, y, and z, and solve the equation. $\frac{|y - 4x|}{2x}$ = $\frac{|-6 - 4(3)|}{2(3)}$ = $\frac{|-6 - 12|}{6}$ = $\frac{|-18|}{6}$ = $\frac{18}{6}$ = 3