Q5 of 92 Page 71

Let us solve the following simultaneous equations in two variables by the method of comparison:


expressing the equations in terms of one variable


⇒ 4x – 4y = 3y – 3


⇒ 4x = 7y – 3


………[1]



⇒ 4x – 5y = 7x – 49


⇒ 3x = 49 – 5y


………[2]


by comparing eq. [1] and eq. [2]



⇒ 21y – 9 = 196 – 20y


⇒ 41y = 205


⇒ y = 5 ………[3]


by using [3] in [1]





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