Question

Solve the pair of equations : 0.1 x - 0.2 y = 2 and x + y = 17 *

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Answer 1

Answer:

0.1x -0.2y = 2 ---(1)

x+y = 17 ---(2)

equation(1) subtracted by equation(2)×0.1

=>0.1x-0.2y-(0.1x+0.1y) = 2-1.7

=> -0.2y-0.1y = 0.3

=> -0.3y = 0.3

=> y = -1

so, x = 17-y= 18 (ans)