Question

19. The solution of the system of linear equations 0.4x + 0.3y = 1.7 and 0.7x -0.2 y = 0.8 is (1) X = 3, y = 2 (2) x = 2, y = - 3 (3) x = 2, y = 3 (4) None of these

11th - 12th Class

Maths

Solution

109

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19. (3) Given system of linear equations are ( frac{4 x}{10}+frac{3 y}{10}=frac{17}{10} ) and ( frac{7 x}{10}-frac{2 y}{10}=frac{8}{10} ) ( therefore ) [ 4 x+3 y=17 ] and ( quad 7 x-2 y=8 ) On solving Eqs. (i) and (ii), we get ( x=2 ) and ( y=3 )