Question
Explain the concept of direct variation.
✓
Answer
When two variables are connected to each other in such a way that if we increase the value of one variable, the value of other variable also increases and vice−versa. Similarly, if we decrease the value of one variable, the value of other variable also decreases and vice−versa.Therefore, if the ratio between two variables remains constant, it is said to be in direct variation.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The size of a matchbox is $4 cm \times 2.5 cm \times 1.5 cm$. What is the volume of a packet containing 144 matchboxes? How many such packets can be placed in a carton of size $1.5 m \times 84 cm \times 60 cm$ ?
→Find the rate of discount being given on a shirt whose selling price is Rs. 1092 after deducting a discount of Rs. 208 on its marked price.
The difference between the ages of two cousins is 10 years. 15 years ago, if the elder one was twice as old as the younger one, find their present ages.
Radius of a circle with centre O is 25 cm. Find the distance of a chord from the centre if length of the chord is 48 cm.
Find the number of sides of a regular polygon when each of its angles has a measures of:-
160°
160°
In 10 days, the earth picks up $2.6 \times 10^8$ pounds of dust from the atmosphere. How much dust will it pick up in 45 days?
→Find the smallest number by which 2925 must be divided to obtain a perfect square. Also, find the square root of the perfect square so obtained.
The circumference of the base of a cylinder is 88cm and its height is 15cm. Find its curved surface area and total surface area.
Making use of the cube root table, find the cube root 9800
Add the following algebric expressions:
$\frac{7}{2}\text{x}^{3}-\frac{1}{2}\text{x}^{2}+\frac{5}{3},$$\frac{3}{2}\text{x}^{3}+\frac{7}{4}\text{x}^{2}-\text{x}+\frac{1}{3},$$\frac{3}{2}\text{x}^{2}-\frac{5}{2}\text{x}-2$
→$\frac{7}{2}\text{x}^{3}-\frac{1}{2}\text{x}^{2}+\frac{5}{3},$$\frac{3}{2}\text{x}^{3}+\frac{7}{4}\text{x}^{2}-\text{x}+\frac{1}{3},$$\frac{3}{2}\text{x}^{2}-\frac{5}{2}\text{x}-2$