Q1 of 71 Page 58

Solve the following pairs of linear equations by the method of substitution:

3x — y = 0, x — y + 6 = 0

3x – y = 0

⇒ y = 3x …[1]


By substituting eq[1] in x – y + 6 = 0


x – (3x) + 6 = 0


⇒ x = 3


Now, by eq[1]


3x – y = 0


∴ 3(3) – y = 0


⇒ y = 9


⇒ x = 3, y = 9


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