Answer:
Step-by-step explanation:
X ∝ y
introducing proportionality constant , we have
x = ky
given : x = 9 when y = 4 , substitute the given values into the equation in order to get the constant
i.e 9 = k x 4
k = 9/4
substitute k = 9/4 into the equation in order to get the formula connecting x and y
⇒ x = 9/4 y
(b) To find x when y = 8, substitute the value of y into the formula
i.i x = 9/4 x 8
x = 9 x 2
x = 18
