how we know that we - or+ in elimination method Related: Elimination Method Part 1 - Pair of Linear Equations in Two Variables, CBSE, Class 10, Mathematics

Question

how we know that we - or+ in elimination method Related:  Elimination Method Part 1 - Pair of Linear Equations in Two Variables, CBSE, Class 10, Mathematics

Answer

Simple h Yaar

if the equations have same sign on any one variable then Substract ...

if different , add.......

Answer

We always have to do  subtraction

Answer

After forming two equations the next step will be:-
for example-
1st case
9x-4y=2000;7x+4y=1000
here you will observe that coefficient of y is same i.e. 4 and has opp. signs first negative and then positive at this time you have to 'add' the equations so. that -4y and +4y will get eliminated directly.
2nd case
9x+4y=2000;7x+4y=1000
here coefficients are same i.e. +4y and +4y so this tme you have to 'substract' the two equations so that u can eliminate them.
I hope with this example u will understand properly!

Answer

How to determine the sign in the elimination method:

- In the elimination method, we are solving a system of linear equations by adding or subtracting the equations to eliminate one variable and solve for the other.

Determining the sign:

- When we add or subtract the equations in the elimination method, we need to pay attention to the signs of the coefficients of the variables.

- If the coefficients of the variable we are eliminating are the same in both equations, we use the sign of the coefficient of the other variable to determine whether we add or subtract the equations.

- If the coefficients are different, we must first make the coefficients the same by multiplying one or both equations by appropriate constants.

- After making the coefficients the same, we use the sign of the coefficient of the variable we are eliminating to determine whether we add or subtract the equations.

- If the coefficient is positive, we subtract the equations. If the coefficient is negative, we add the equations.

- By following these rules, we can successfully eliminate one variable and solve for the other in the elimination method.

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