1.

X – intercept of the line ax + by + c = 0 is A) \(\cfrac{-c}a\)B) \(\cfrac{c}a\)C) \(\cfrac{a}c\)D) \(\cfrac{1}c\)

Answer»

Correct option is (A) \(\frac{-c}{a}\)

Given line is ax+by+c = 0

\(\Rightarrow ax+by=-c\)

\(\Rightarrow\frac{ax}{-c}+\frac{by}{-c}=1\)

\(\Rightarrow\frac{x}{\frac{-c}{a}}+\frac{y}{\frac{-c}{b}}=1\)

By comparing with intercept form of line, we get

X-intercept \(=\frac{-c}a\) and Y-intercept \(=\frac{-c}b\)

Hence, X-intercept of the line ax+by+c = 0 is \(\frac{-c}{a}.\)

Correct option is A\(-\cfrac{c}a\)



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