Question

can anyone help me to understand the substitute method in linear equations in two variables?

Answer 1

First take out the equation in term of only a single variable, then put this value in second equation.

For example:

Let suppose we take.
2x+ y= 5.... (1)

2x+ 3y= 15 ...(2)

Now, we have to find the value of x in (1)

so, 2x+ y=5... [Given]

=> 2x=5-y

=> x=(5-y)/2

Now,putting this value in 2.

=> 2(5-y)/2 +3y= 15

=> 5-y+3y= 15

=> 5+2y= 15

=> 2y= 10

=> y= 5

Now,put the value of y in 1

=> 2x+ 5 = 5

=> 2x= 0

=> x=0

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Hope you understand my method..

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