Given: y varies directly as x. if y = 5 when x = 4, what is the value of y when x = 12? a) 9.6 b) 10 c) 12 d) 15

D) 15

Step-by-step explanation:

We know the formula for direct variation is

y=kx

Substituting y=5 and x=4 we can calculate k

5=k4

Divide each side by 4

5/4 =k

Now y= 5/4 x

If x =12

y =5/4*12

y = 15

answer is because 4×10=40

and 98×4= is 392

40,392