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Solve by substitution method 3x-y=3 9x-3y=9 …

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Solve by substitution method 3x-y=3 9x-3y=9 Plz solve this ??????

Posted by Saswat Kumar Jena 5 years, 4 months ago

CBSE > Class 10 > Mathematics

3 answers

Gaurav Seth 5 years, 4 months ago

3x-y=3........1
9x-3y=9..(divided by 3)
3x-y=3......2

3x=3-y
X=3-y/3

sub X in 1
3x-y=3
3(3-y/3)-y=3
3-y-y=3
-2y=3-3

y=0

sub y in 2

3x-y=3
3x-0=3
3x=3

X=1

5Thank You

Yogita Ingle 5 years, 4 months ago

3x-y=3........(i)
9x-3y=9..(divided by 3)
3x-y=3......(i)

3x=3-y
X=3-y/3

sub X in (i)
3x-y=3
3(3-y/3)-y=3
3-y-y=3
-2y=3-3
y=0
sub y in (ii)
3x-y=3
3x-0=3
3x=3
X=1

2Thank You

Lucifer?? Morningstar?? 5 years, 4 months ago

Put the value,Y=3x-3 in eq (2) 9x-3(3x-3)=9 => 9x-9x+9=9.. hence, proved

2Thank You

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