• The coordination of the plane
Alison.co Geometry with coordinates
Khan
Graphing points and naming quadrants
Points on the coordinate plane
Coordinate plane word problems in all four quadrants
Reflecting points on the coordinate plane
Geometry problems on the coordinate plane
Coordinate plane word problems with polygons
• The distance formula
Khan
• The midpoint formula
Khan
• The idea of slope as Rise/Run
• The slope formula
Khan
video Slope of a line
• The meaning of positive, negative, zero and undefined slope
Khan
• The use of slopes to investigate if two lines are parallel
Alison.com Parallel lines
Khan
• The use of slopes to investigate if two lines are perpendicular or not
Alison.com Perpendicular lines
Khan
Recognizing parallel and perpendicular lines
• That 3 points on the coordinate plane but not all on the same vertical line are collinear if and only if the slope between any two of them is the same
(This approach can be used to find the equation of a line between two points)
Khan
Ratios of distances between colinear points
• The equation of a line in the forms : y-y1=m(x-x1) y=mx+c ax+bx+c=0
Alison.com Equation of a straight line
Khan
Converting between slope-intercept and standard form
Converting between point-slope and slope-intercept form
• The significance of the variables m and c
Khan
Interpreting linear relationships
• Whether or not a point is in a line
Khan
Ordered pair solutions to linear equations
• Where a line intersects the axes and why these points might be of interest to someone trying to interpret or plot a graph
Khan
• The interpretation of the intercepts in context
Khan
Interpreting and finding intercepts of linear functions
• How to find the slope of a line given its equation
Khan
Analyzing and identifying proportional relationships
• How to solve problems involving slopes of lines
Khan
Constructing and comparing proportional relationships
Graphing proportional relationships
Rates and proportional relationships
Equations of parallel and perpendicular lines
• How to solve problems involving the intersection of two lines
Khan
Systems of equations with simple elimination
Systems of equations with elimination
Systems of equations with substitution
Systems of equations word problems
Graphing systems with one, zero, or infinite solutions
Systems with one, zero, or infinite solutions
Other Links
Students - Project Maths - Learning and teaching for the 21st Century