Question

Suppose y varies directly with x and y= 24 when x=8 what is the value of y when x =10

A. 10
B. 30
C. 80
D. 240

Answer 1

Answer:

B. 30

Step-by-step explanation:

y  ∝  x  or  y  =  k  ⋅  x  or  k  =  $\frac{y}{x}$  ;   k is constant of variation.  

y  =  24  ;  x  =  8  ∴  k  = $\frac{24}{8}$ =  3  ∴  y  =  3  x.  So When  x  =  10  ;  y  =  3  ⋅  10  =  30

y  =  30