9.Straight Lines Quiz

What is the formula to find the distance between two points (x1, y1) and (x2, y2)?

• √(x2 - x1) * (y2 - y1)

• √(x2 - x1)^2 + (y2 - y1)^2

• √(x2 - x1) - (y2 - y1)

• √(x2 - x1) + (y2 - y1)

What are the coordinates of a point dividing the line segment joining the points (x1, y1) and (x2, y2)?

• (x1 * x2) / 2, (y1 * y2) / 2

• (x1 - x2) / 2, (y1 - y2) / 2

• (x1 + x2), (y1 + y2)

• (x1 + x2) / 2, (y1 + y2) / 2

What is the condition for parallel lines?

• m1 = m2

• m1 = -1/m2

• m1 * m2 = -1

• m1 = m2 + 1

What is the condition for perpendicular lines?

• m1 * m2 = -1

• m1 = -1/m2

• m1 = m2

• m1 = m2 + 1

What is the formula to find the angle between two lines?

• tan(α2 – α1) = tan α2 - tan α1 / 1+ tan α1 tan α2

• tan(α2 – α1) = tan α2 - tan α1 / 1- tan α1 tan α2

• tan(α2 – α1) = tan α2 - tan α1 / 1* tan α1 tan α2

• tan(α2 – α1) = tan α2 - tan α1 / 1/ tan α1 tan α2

What is the point-slope form of a line?

• y = mx + c

• m = (y - y0) / (x - x0)

• y - y0 = m(x - x0)

• y = mx

What is the slope-intercept form of a line?

• y = mx + c

• m = (y - y0) / (x - x0)

• y - y0 = m(x - x0)

• y = mx

What is the formula to find the distance between two parallel lines?

• D = |C1 - C2| / A^2 + B^2

• D = |C1 - C2| / A^2 - B^2

• D = |C1 - C2| / A^2 * B^2

• D = |C1 - C2| / √A^2 + B^2

What is the slope of a line?

• The angle made by the line with negative direction of x-axis

• The ratio of vertical change to horizontal change

• The distance between two points on the line

• The angle made by the line with positive direction of x-axis

What is the condition for two lines to be perpendicular?

• m1 = m2 + 1

• m1 * m2 = -1

• m1 = -1/m2

• m1 = m2