4. WHAT IS DIRECT VARIATION
•It is describes as simple relationship between
two variables, ( if one number increases so
does the other.)
• it is also called direct proportion.
5. Suppose that Imac wants to
buy his favorite Hansel Biscuit
in a Supermarket.
6. • Where
• P = kn or k = p/n = 120/2 = Php 60.00
• or P = 120 when n = 2
• Find P if n = 5
• P = kn = 60 (5) = Php 300.00
• The price of Hansel varies directly as the number of packs.
If the Price (P) varies directly as the number of packs (n) and P = Php
120.00 when n = 2 packs. Write the variation equation and find P
when n = 5 packs.
8. WHAT IS INVERSE VARIATION
•Relationships between two variables
which can be expressed by an
equation
• As one number increases the other
decreases
9. Last week, Aldrin’s family went
to Antipolo to deliver delicious
chorizo from Cebu City.
10. Where
• t =
𝑘
𝑠
or k = st =
20 𝑘𝑚
ℎ
3 ℎ = 60 km
• t =
𝑘
𝑠
=
60 𝑘𝑚
40 𝑘𝑚
1ℎ
=
60𝑘𝑚
1
1ℎ
40 𝑘𝑚
=
60ℎ
40
= 1.5ℎ
• The time (t) varies inversely as the average speed (s) of the
car.
Suppose that the distance from Amadeo to Antipolo is 60 km. If the
time (t) varies inversely as the average speed (s) of the car and the
time (t) = 3 hours when average speed (s) = 20 km/h. Write the
variation equation and find t when average speed (s) = 40 km/h
going back to Amadeo.