1.

The equation of the line having slope 1 and passing through (3, 2) is A) x + y = 1 B) x – y = 1 C) 2x – y + 1 = 0 D) x – 2y + 1 = 0

Answer»

Correct option is (B) x – y = 1

Given that slope of required line is m = 1 & it passes through point (3, 2).

Let equation of the required line is

\(y=mx+c\)

\(\Rightarrow\) \(y=x+c\)            \((\because m=1)\)

Put x = 3 & y = 2     \((\because\) Required line passes through (3, 2))

\(\therefore2=3+c\)

\(\Rightarrow c=2-3=-1\)

Put c = -1 in \(y=x+c,\) we get

\(y=x-1\)

\(\Rightarrow x-y=1\)

Hence, the equation of required line is \(x-y=1.\)

Correct option is B) x – y = 1



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