kimyangb kimyangb

29-09-2016
Mathematics

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2x=56-20y
-16x=92-20y

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nobillionaireNobley nobillionaireNobley

30-09-2016

2x = 56 - 20y => x = 56/2 - 20y/2 => 28 - 10y . . . (1)
-16(28 - 10y) = 92 - 20y
-448 + 160y = 92 - 20y
160y + 20y = 92 + 448
180y = 540
y = 540/180 = 3
From (1), x = 28 - 10(3) = 28 - 30 = -2.

Therefore, x = -2 and y = 3.

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