If y varies directly as x, and y =-4 when x=8, find y when x=3

Another way of looking at it!

y

=

10

Explanation:

This is a ratio question in disguise.

By parts of the question:

"When y varies directly with x"

→

y

x

"

"if y=8 when x=4"

→

.

.

y

x

=

8

4

"how do you find y when x=5"

→

y

x

=

8

4

=

y

5

so

y

=

8

×

5

4

=

10

This is the same thing as using 'k' in the other solution

Step-by-step explanation:

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above