SELECT * FROM question_mgmt as q WHERE id=9518 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=6 AND chapterId=270 and ex_no='3' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)
Solve the following pair of linear equations by the substitution method.
(i) x + y = 14 …………….(1)
x – y = 4 …………….(2)
From the equation (1), we get
x = 14 - y …………….(3)
Putting the value of x in equation (2), we get
(14 - y) – y = 4
14 – y – y = 4
- 2y = - 10
Putting the value of y in equation (3),
x = 14 – 5
x = 9
Hence, x = 9 and y = 5
(iii) 3x - y = 3 …………….(1)
9x – 3y = 9…………….(2)
From the equation (1), we get
Putting the value of y in equation (2), we get
9x – 3 (3x - 3) = 9
9x – 9x + 9 = 9
9 = 9, which is true.
Therefore, pair of linear equation has infinite many solutions.
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