Question

Y varies directly with x Part 1

19. If y = 4 when x = -2, find x when y = 6
20. If y = 6 when x = 2, find x when y = 12
21. If y = 7 when x = 2, find x when y =3

Answer 1

19. -3

20. 4

21. 6/7

Explanation:

Since the variables are proportional, you can multiply the given x value by the new/old ratio of y-values.

19. x = 6/4(-2) = -3

20. x = (12/6)(2) = 4

21. x = (3/7)(2) = 6/7