Question

4. Solve the following pair of linear equations by the substitution method.
(1) 3x - y = 3 and 9x - 3y = 9
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Answer 1

Step-by-step explanation:

3x−y=3 …………(1)

9x−3y=9 ………..(2)

Substitution method

3x−y=3

y=3x−3 [Put in equation 2]

9x−3(3x−3)=9

9x−9x+9=9

∴ ∞ solutions because both lines same

3x−y=3 ……..(1)

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3(3x−y)=3×

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3 ………. (2)

1=2.