1. How is a direct variation problem translated into symbols?
1.1. y/x = k
1.2. y = kx
2. How is direct variation viewed in a real life situation
2.1. The wattage usage is directly proportional to the electric bill.
2.2. the distance traveled by a moving vehicle varies as the time the vehicle is moving
2.3. the quality of goods bought is directly proportional to ts price
3. How is a direct variation real life problem solved?
3.1. The area of a roundabout is directly proportional to the square of its radius. If a round about has an area of 100 sq. m. when its radius is 10 m. what is the area of a roundabout whose radius is 15?
3.2. A = kr^2
3.3. k = 100/ 10^2
3.4. k = 1
3.5. the area of the roundabout then is. A = 1 (15^2); A = 225 sq m.
4. What is a direct Variation?
4.1. A direct variation is a relationship that exist between variables such that there exist a non-zero k as the ratio of the quantities.
5. How is direct variation expressed?
5.1. Table of value
5.2. Equation
5.3. Ratio & Proportion
5.4. graph
6. How does a direct variation look in a graph?
6.1. The grap is a straight line passing through the origin.
6.2. for a direct square relationship the graph is a half parabola with vertex at (0,0)
