Q. 1 A5.0( 1 Vote )

Solve the following equations by substitution method.

x + 3y = 10; 2x + y = 5

Answer :

[In substitution method, we have to find value of one variable in terms of the other variable from any one of the two given equations . Then, we will substitute this value in the other equation. By doing this, we will get a equation in one variable which can be solved easily]


x + 3y = 10……(1)


2x + y = 5 …..(2)


From eq(1),


X + 3y = 10


x = 10 – 3y


Substituting the value of x in eq(2)


2x + y = 5


2(10 – 3y) + y = 5


20 – 6y + y = 5


20 – 5y = 5


5y = 20 – 5


5y = 15




Substituting value of y in eq(1)


x + 3y = 10


x + 3×3 = 10


x + 9 = 10


x = 10 – 9


x = 1


Hence,


x = 1, y = 3




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