1.

If the slope of the line through (2, -7) and (x, 5) is 3 then x = A) 4 B) 5 C) 6 D) 7

Answer»

Correct option is (C) 6

Slope of line through points (2, -7) and (x, 5) is

\(m=\frac{y_2-y_1}{x_2-x_1}\)

\(=\frac{5-(-7)}{x-2}=\frac{12}{x-2}\)

But given that slope is 3.

\(\therefore\) \(\frac{12}{x-2}=3\)

\(\Rightarrow x-2=\frac{12}3=4\)

\(\Rightarrow x=4+2=6\)

Correct option is C) 6



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