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21-12-2017
Mathematics

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7k+4l=20 and -8k+2l=10
What is the value of k?

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anchitam9 anchitam9

23-12-2017

7k+4l=20
(-8k+2l=10)-1
8k-4l=-10
+
7k+4l=20
15k+0=10
10/15= 2/3
k=2/3

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