Q. 5 B5.0( 6 Votes )

Let us solve the following simultaneous equations in two variables by the method of substitution.




Answer :

Given … (1)


And … (2)


Expressing x of equation (1) in terms of y,





… (3)


Substituting (3) in (2),






21y – 15 = 6y


21y – 6y = 15


15y = 15


y = 1


Substituting y value in (3),




x = 1


By solving, we get x = 1 and y = 1.


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