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Algebraic Methods of Solving a Pair of Linear Equations - Elimination Method

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2) Elimination Method- In this method we need to eliminate one variable out of the two equations. This can be further explained using a example
`4x-9y=20` .....eq1 
`3x-7y=20` .....eq2
Here we have to make one of the coefficient of both the equations equal. For doing this we will multiply coefficient of x i.e 9 with eq2 and 7 with eq1 
`3 (4x-9y=20)`
`12x-27y= 60` ....eq3
`4(3x-7y=20)`
`12x-28y= 80` ....eq4
Now we will subtract eq4 from eq3
`12x-27y= 60` 
`12x-28y= 80` 
We get `y=-20` thus `4x-9(-20)=20`
`4x+180=20` 
`4x= -160`
`x= -40`

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Pair of Linear Equation in two variable part 11 (Algebraic Elimination) [00:14:29]
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