If x varies directly as y, then

x	12	6
y	48	—

Solution:

If x varies directly as y we can write:

x ∝ y

x/y = k

Where k is proportionality constant

Therefore given the values in the above table can be written as:

(12)/48 = 6/x

x = 6 × (48/12)

x = 24

✦ Try This: If x varies directly as y, then

x	8	9
y	24	—

If x varies directly as y we can write:

x ∝ y

x/y = k

Where k is proportionality constant

Therefore given the values in the above table can be written as:

(8)/24 = 9/x

x = 9 × (24/8)

x = 27

☛ Also Check: NCERT Solutions for Class 8 Maths Chapter 13

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NCERT Exemplar Class 8 Maths Chapter 10 Problem 27

If x varies directly as y, then x 12 6 y 48 —

Summary:

If x varies directly as y, then x = 24

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