Question

subsitution method 3x-y=3,9x-3y=9

Answer 1

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Answer 2

we have,
3x-y=3.................I


9x-3y=9
=>3(3x-y=3)

=>3x-y=3.............ll


x=3+y/3


now put the value of x in equation first


3(3+y/3)–y=3
=>3+y/3. — y = 3/3


=>3+y–3y/3=1

=>3–2y=3
=>–2y=3-3
=>–2y=0

=>y=0


now put the value of Y in equation first


3x–y=3

=>3x–0=3
=>3x=3
=>x=3/3

=>x=1........