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### Grade 8 - Mathematics2.11 Direct Proportion - II

 Example: x is directly proportional to y, if x=3 and y=2, find the constant of variation and then find x when y = 6? Solution: x ¥ y Þ x = ky Given that x= 3, y = 2 3 =2k \ k = 3/2 Þ Constant of variation is 3/2 No, find x when y = 6. y = 6 Þ x = (3/2) * 6 x = 3 * 3 x = 9 Directions: Solve the following problems. Also write at least 10 examples of your own.
 Q 1: x is directly proportional to y, if x=9 and y=8, find the constant of variation and then find x when y = 12.27/22272/27 Q 2: x is directly proportional to y, if x=7 and y=6, find the constant of variation and then find y when x = 7.6/7677/6 Q 3: x is directly proportional to y, if x=7 and y=5, find the constant of variation and then find y when x = 10.7/5075050/7 Q 4: x is directly proportional to y, if x=12 and y=13, find the constant of variation and then find x when y = 5.1313/6060/1360 Q 5: x is directly proportional to y, if x=5 and y=7, find the constant of variation and then find x when y = 5.7/2525/7257 Q 6: x is directly proportional to y, if x=4 and y=2, find the constant of variation and then find y when x = 6.12693 Q 7: x is directly proportional to y, if x= and y=4, find the constant of variation and then find x when y = 8.3/548None of these Q 8: x is directly proportional to y, if x=2 and y=3, find the constant of variation and then find x when y = 4.833/88/3 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!