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Question
For simultaneous equations in variables x and y, Dx = 49, Dy = –63, D = 7 then what is x?
Options
7
–7
`1/7`
`(-1)/7`
`-1/7`
MCQ
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Solution
7
Explanation:
Given Dx = 49, Dy = −63, D = 7
From cramer's rule
x = `"D"_"x"/"D"`, y = `"D"_"y"/"D"`
⇒ x = `49/7`
⇒ x = 7
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