1.

The slope of the line parallel to 3x – by + 7 = 0 is 3 then b = ……………….. A) 3 B) 4C) 1 D) 5

Answer»

Correct option is (C) 1

Given line is 3x – by + 7 = 0

\(\Rightarrow by=3x+7\)

\(\Rightarrow y=\frac3bx+\frac7b\)

\(\therefore\) Slope of given line is \(\frac3b\)

\(\therefore\) Slope of line parallel to given line is \(\frac3b.\)

But given that the slope of line parallel to \(3x-by+7=0\) is 3.

\(\therefore\) \(\frac3b\) = 3

\(\Rightarrow b=\frac33=1\)

Correct option is C) 1



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