ICSE-VIII-Mathematics
10: Direct and Inverse Variations Class 8 Maths
- #1Check whether x and y vary inversely or not. (i)
(ii) 
(iii) 
(i) (ii) (iii) Ans : x and y are inversely proportional.
Then xy are equal. (i) xy = 4 × 6 = 24
xy = 3 × 8 = 24
xy = 12 × 2 = 24
xy = 1 × 24 = 24
xy in each case is equal.
x and y are inversely proportional (ii) xy = 30 × 60 = 1800
xy= 120 × 30 = 3600
xy = 60 × 30= 1800
xy = 24 × 75 = 1800
xy in each case is not equal.
x and y are not inversely proportional. (iii) xy = 10 × 90 = 900
= 30 × 30 = 900
= 60 × 20 = 1200
= 10 × 90 = 900
xy in each case is not equal.
x and y are not inversely proportional. (i) xy = 4 × 6 = 24
xy = 3 × 8 = 24
xy = 12 × 2 = 24
xy = 1 × 24 = 24
xy in each case is equal.
x and y are inversely proportional (ii) xy = 30 × 60 = 1800
xy= 120 × 30 = 3600
xy = 60 × 30= 1800
xy = 24 × 75 = 1800
xy in each case is not equal.
x and y are not inversely proportional. (iii) xy = 10 × 90 = 900
= 30 × 30 = 900
= 60 × 20 = 1200
= 10 × 90 = 900
xy in each case is not equal.
x and y are not inversely proportional.
- #1-iAns : xy = 4 × 6 = 24
xy = 3 × 8 = 24
xy = 12 × 2 = 24
xy = 1 × 24 = 24
xy in each case is equal.
x and y are inversely proportional
- #1-iiAns : xy = 30 × 60 = 1800
xy= 120 × 30 = 3600
xy = 60 × 30= 1800
xy = 24 × 75 = 1800
xy in each case is not equal.
x and y are not inversely proportional.
- #1-iiiAns : xy = 10 × 90 = 900
= 30 × 30 = 900
= 60 × 20 = 1200
= 10 × 90 = 900
xy in each case is not equal.
x and y are not inversely proportional.