Maths / Direct and Inverse Variation / Direct Variation

QUESTION
 

Fill in the missing terms in the following tables,if x and y vary directly.

x6810b
y1520a40
EXPLANATION
Explain TypeExplanation Content
Text
x6810b
y1520a40

large frac{x}{y}=k frac{x}{y}=frac{6}{15}=frac{2}{5} frac{x}{y}=frac{8}{20}=frac{2}{5}

large Rightarrow frac{10}{a}=frac{2}{5} Rightarrow a=frac{10times5 }{2}Rightarrow 25

large Rightarrow frac{b}{40}=frac{2}{5} Rightarrow b=frac{2times40}{5}Rightarrow 16

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