An equation grapher is a graphing calculator that draws the graph of any equation of the form G(x,y) = F(x,y) where each side is an expression that can contain x and y.
An equation grapher is a more general graphing tool than a function grapher, which only draws the graph of equations in the form y = f(x) where the right hand side is an expression in x only.
An equation graphing calculator can also be used to graph implicitly defined functions.
To graph equations the equal sign must be used to enter both sides of the equation. This allows you to graph, for example, equations of lines in point-slope forms, equations of conic sections (circles, parabolas, hyperbolas and ellipses) and level curves as well as implicit functions.
- pi is replaced by π.
In addition to inputting data — by first pressing the gear button — you can use your mouse to perform some functionality unique to this interactive polar grapher as outlined below.
- Click on (or near) an axis and move your mouse. That will rotate the axis. The graph(s) are re-drawn in the generalized polar coordinate system. Click again to release the axis.
- Drag the mouse to move the coordinate system together with the graphs.
- Double-click in the canvas to move the origin to where was clicked.
- Hold down Alt key and click on an axis to change the scale (zoom in one direction); the point which was clicked will be labelled "1" (or "-1") and becomes the new unit for that axis.
Lines
y = 1 x = 1 y = x+1 x = y+1 3x + y = 2 3x - y +5 = 4x+2y-2Circles
x^2+y^2 = 9 (x-2)^2 + (y-2)^2 = 4Ellipses
x^2/4 + y^2/9 = 1 x^2-xy+2y^2-x-2y-8=0Parabolas
y=x^2 y = x^2-4x+4 2x^2-4xy+2y^2-x-2y-2=0Hyperbolas
x^2/4 - y^2/9 = 1 24x^2-50xy-49y^2+97x+93y-164=0Other graphs
x^2 = y^2 sin(xy) = cos(xy)
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To copy or save graphs right click on the image of a saved graph below and select "Copy image" or "Save image" from the pop-up menu.