Question

z/2=y/x.....In the equation above, the numbers x, y, and z are either positive or negative. Which of the following must be equal to 4?
a.2x
b.2z
c.xz/2y
d.2y/xz
e.2xz/y

Answer 1

\[\frac{ z }{ 2 }=\frac{ y }{ x }\]
\[zx=2y\]
\[4=\frac{ 2y }{ zx }\]
total guess.. should probably ask someone else :/

Answer 2

thanks anyway

Answer 3

Cross multiply and you see that 2y = zx
Therefore 2 = zx/y
Multiply both sides by 2.

Answer 4

(important that we know neither y or x is zero)