Q3 of 186 Page 3

Solve the following system of equations by substitution method:

s —t = 3


Given equations are


s – t = 3 …(i)


…(ii)


From eqn (i), we get


⇒ s = 3 + t …(iii)


On substituting s = 3 + t in eqn (ii), we get




⇒ 6 + 2t + 3t = 6×6


⇒ 5t = 36 – 6



Now, putting the t = 6 in eqn (iii), we get


⇒ s = 3 + 6


⇒ s = 9


Thus, s = 9 andt = 6 is the required solution.


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