Help , Medal && Fan.!(:

The number of calories burned, C, varies directly with the time spent exercising, t. When Lila bikes for 3 hours, she burns 900 calories. Which of the following equations shows this direct linear variation?

C = 900t
C = 300t
C = 3t
C = t

Question

Help , Medal && Fan.!(:



 The number of calories burned, C, varies directly with the time spent exercising, t. When Lila bikes for 3 hours, she burns 900 calories. Which of the following equations shows this direct linear variation?
   
       C = 900t
        C = 300t
        C = 3t
        C = t

campbell_st · Answer

ok... so direct variation is 

C=kt

so you need to use the information to find k, the constant of variation 

you know C = 900 when t = 3

substitute them and find k

then match the answer to the equation choices.

anonymous · Answer

It is the first one!

campbell_st · Answer

and it's not the 1st answer

900 = k x 3