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Complite the following table given that x varies directly as y .  x 6 8 10 ... 20 y 15 20 ... 40 ... - Mathematics

Sum

Complite the following table given that x varies directly as y

x 6 8 10 ... 20
y 15 20 ... 40 ...
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Solution

\[\text{ Here, x and y vary directly }  . \]
\[ \therefore x = ky\]

\[ x = 6 \text{ and }  y = 15\]
\[i . e . , 6 = k \times 15\]
\[ \Rightarrow k = \frac{6}{15} = 0 . 4\]
\[\text{ For x = 10 and k = 0 . 4, we have: }  \]
\[y = \frac{10}{0 . 4} = 25\]
\[\text{ For y = 40 and k = 0 . 4, we have: } \]
\[x = 0 . 4 \times 40 = 16\]
\[\text{ For x = 20 and k = 0 . 4, we have: } \]
\[y = \frac{20}{0 . 4} = 50\]

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APPEARS IN

RD Sharma Class 8 Maths
Chapter 10 Direct and Inverse Variations
Exercise 10.1 | Q 5.3 | Page 6
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