math

• Interactive Coordinate Plane

  Plot up to eight labelled points on a Cartesian grid you can size from -5 to -20, by dragging or by typing coordinates, and read off each quadrant plus the distance and midpoint between points.

• Interactive Multiplication Chart

  Hover or arrow-key across a 12×12 multiplication chart to light up any times-table fact, with an area model that shows why a × b is a rectangle of that many squares.

• Interactive Unit Circle

  Drag the point or type any angle in degrees or radians, read the exact coordinates and sine, cosine and tangent, check the chart of all sixteen special angles, then fill in a blank circle from memory.

• Parabola Explorer: Graph Quadratic Functions Interactively

  Drag a, b, and c on a live graph of y = ax² + bx + c and watch the vertex, axis of symmetry, roots, and y-intercept respond, with the vertex formula, discriminant, and a full worked example.

• Point-Slope Form: Build a Line From One Point, Interactively

  Drag one anchor point and set a slope: the point-slope equation writes itself with live numbers, next to the same line rewritten in slope-intercept form.

• Slope of a Line: Interactive Rise Over Run Explorer

  Drag points A and B on a grid and watch the dashed rise-over-run triangle, the slope formula, and the line's equation update live, including the zero and undefined slope cases.

• Slope-Intercept Form: Interactive y = mx + b Grapher

  Drag the Slope m and Intercept b sliders and the line y = mx + b redraws live: b pins the y-intercept at (0, b), m sets the rise for every run of 1, with a worked graphing recipe and examples.

• Systems of Equations: Solve by Graphing, Interactively

  Steer two lines with slope and intercept sliders; the crossing point is the solution of the system. Make the slopes equal to see the parallel (no solution) and same-line (infinitely many) cases.

• Vertex Form: Shift and Stretch the Parabola, Interactively

  Drag the parabola's vertex and h and k follow it in y = a(x - h)² + k, with what each letter does, how to read the vertex, axis and both intercepts off it, and nine worked examples.