Q. 1 B5.0( 2 Votes )

Solve the followi

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]


2x + y = 1….(1)


3x – 4y = 18….(2)


From eq(1),


2x + y = 1….(1)


y = 1 – 2x


Substituting the value of y in eq(2)


3x – 4y = 18….(2)


3x – 4(1 – 2x) = 18


3x – 4 + 8x = 18


11x + 4 = 18


11x = 18 + 4


11x = 22


x =


x = 2


Substituting the value of x in eq(1),


2x + y = 1


2×2 + y = 1


y = 1 – 4


y = – 3


Hence,


x = 2,y = – 3


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