Question

Q. Solve the following system of linear equations by substitution method:

2x – y = 2

x + 3y =15



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Answer 1

Step-by-step explanation:

y=2x-2

so,

x+3(2x-2)=15

x+6x-6=15

7x=21

x=3 Ans

Answer 2

Answer:

2x-y=2

x+3y=15

Step-by-step explanation:

2x=2+y

x=(2+y)/2

....

x+3y=15

(2+y)/2+3y=15

(2+y+6y)/2=15

2+y+6y=15/2

2+7y=15/2

7y=15/2-2

7y=(15-4)/2

7y=11/2

y=11/2×1/7

[y=11/14]