Question

Suppose y varies directly with x. If x = 7 when y = 23, what is the value of y when x = 21?
Select one:
a. 59
b. 69
c. 89
d. 79

Answer 1

7/23 = 21/x
cross multiply
(7)(x) = (21)(23)
7x = 483
x = 483/7
x = 69

answer is 69

Answer 2

Thanks :) !