Question

if y = -12 when x = 9, find y when x = -4

Answer 1

-12 / 9 = -4 / 3

x / -4 = -4 / 3

Cross multiply and get
3x = 16
x = 16/3

Answer 2

Thank you

Answer 3

find y when x = 10 if y = 8 when x= 20 (using y=kx)

Answer 4

8 = 20k
k = 8 / 20
k = 2 / 5
y = 2/5(10)
y = 4

Answer 5

Thanks