Question

Variable y varies directly with variable x, and y = 45 when x = 9.

What is value of y when x = 2?

y=

Answer 1

y=45 x=9
9*?=45
?=5 so,
2*5=10
y=10

Answer 2

x ----------> y
9 ----x5--->45

Namely,
2-----x5 --->y
y= 2.5 =10