Question

What do we substitute in substitution method? who will answer me immediately I mark him as brainiest answer.​

Answer 1

Step-by-step explanation:

The method of solving "by substitution" works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other. Then you back-solve for the first variable.

In the substitution method you solve for one variable, and then substitute that expression into the other equation. The important thing here is that you are always substituting values that are equivalent. For example: Sean is 5 years older than four times his daughter's age..

Answer 2

Given : substitution method

To find : What to substitute

Solution:

Lets take one example

ax + by   = c     Eq1

dx + ey  = f       Eq2

are the two equations where x & y are variables

a , b ,c , d, e & f are constants

in substitution method  

we will take the value of one variable dependent on other variable  & substitute in other Equation

Case 1  :

from Eq 1      x   = (c - by)/a

and substitute value of x in eq 2

=> d  (c - by)/a  + ey  =  f  

now  we have equation in only variable y

solve it to get y

then substitute value of y  in  x   = (c - by)/a  to get value of x

Case 2  :

from Eq 1      y   = (c - ax)/b

and substitute value of y in eq 2

=> dx  + e(c - ax)/b  =  f  

now  we have equation in only variable x

solve it to get x

then substitute value of x  in  y   = (c - ax)/b to get value of y

Similarly we could do

taking y = (f - dx)/e     or  x  = (f - ey)/d from Eq 2  and substitute in Eq 1

So its up to you which variable to substitute

Learn more:

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