    Question

# Select the correct approach for solving a pair of linear equations in 2 variables by elimination method. i) Add or subtract one equation from the other so that one variable gets eliminated. ii) Multiply both the equations by any non-zero constant to make the coefficients of one variable (either x or y) numerically equal. iii) Solve the equation in one variable (x or y) to get its value. iv) Substitute the value of x (or y) in either of the original equations to get the value of the other variable.

A

(i), (iv), (ii), (iii)

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B

(ii), (i), (iv), (iii)

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C

(ii), (i), (iii), (iv)

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D

(i), (ii), (iii), (iv)

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Solution

## The correct option is C (ii), (i), (iii), (iv) Let there be two equations. x + y = 3....(1) and 2x + y = 4.....(2) 1st step: Multiply equation (1) by 2 to make coefficient of x same in both the given equations. On multiplying, equation (1) becomes 2x + 2y = 6....(3). 2nd step: Subtracting equation (2) by equation (3) i.e. (2x + 2y = 6) - (2x + y = 4) we get y=2. 3rd step: On solving, we get y = 2. 4th step: On putting the value y = 2 in the equation (1), we get x = 1.  Suggest Corrections  0      Similar questions
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