Question

Please show how you did it, so i know how to do these types of problems in the future
If y varies directly with x and y = -7 when x = -1, find x when y = -84.


a 84

b. 7

c. -12

Answer 1

direct variation is

y=kx

you need to find the value of k, so substitute x = -1 and y = -7

so

\[-7 = k \times -1\]

find the value of k

then when you get it... substitute y = -84 and find x, using the k value you just found.