Gradient of horizontal line is………
Slope of vertical line is …………….
L, is horizontal iff m =……………
If slope of AB = Slope o BC then A, B and C are………..
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Two lines are perpendicular If 1 + m1 m2 = ………………..
Equation of x – axis is ………..
Y- intercept of the line 5x + √ 5 y + √ 5 = 0 is ……..
Slope of the line 2y + x + 3 = 0 is ……..
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Two lines l1 and l2 with slopes m1 and m2 are parallel if m1 – m2 =……
L, is vertical iff m = ……………..
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