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Question
Find the values of x and y, if `|(3"x" - "y"),(5)| = |(7) , ("x + y")|`
Solution
`|(3"x" - "y"),(5)|_(2 xx 1) = |(7) , ("x + y")|_(2 xx 1)`
3x - y = 7 -(1)
x + y = 5 -(2)
⇒ x = 5 - y
Putting the value of x in (1)
3(5 - y) - y = 7
⇒ 15 - 3y - y = 7
⇒ - 4 y = -8
⇒ y = 2
from (2)
x + 2 = 5
⇒ x = 3
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