4. Which of the following is not<br />equivalent to -6/21<br />A. 20/-70<br />B. 10/-35<br />C.-9/24<br />D.-26/91
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Consider the equations:
3x−4y=25...(1)
−2x+y=−10...(2)
Multiply equation (2) by 4, we get
−2x(4)+y(4)=−10(4)
⇒ −8x+4y=−40...(3)
Now add equation (1) and (3), we get
3x−8x−4y+4y=25−40
⇒−5x=−15
⇒x=3
Substitute x=3 in equation (2)
−2(3)+y=−10
⇒−6+y=−10
⇒−y=−10+6
⇒−y=−4
Hence, x=3 and y=−4
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