8th Class Mathematics Sample Paper Mathematics Sample Paper - 3

  • question_answer Verify \[x+y=y+x,\] if \[x=\frac{-3}{16}\] and \[y=\frac{1}{9}.\]

    Answer:

    \[x+y=-\frac{3}{16}+\frac{1}{9}\]
    \[=\frac{-3\times 9+1\times 16}{144}\]      
    [\[\because \]LCM of 16 and 9 is 144]
    \[=\frac{-27+16}{144}=\frac{-11}{144}\]
    \[y+x=\frac{1}{9}+\frac{-3}{16}\]
    \[=\frac{1}{9}-\frac{3}{16}\]
    \[=\frac{16\times 1-9\times 3}{144}\]
    \[=\frac{16-27}{144}=-\frac{11}{144}\]
    \[\Rightarrow \]   \[x+y=y+x.\]


adversite


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