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 Depdendent Variable

 Number of equations to solve: 23456789
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 Dependent Variable

 Number of inequalities to solve: 23456789
 Ineq. #1:
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# Solving Equations and Inequalities Graphically

Using a graphing calculator: LEARN how to change the viewing window.
Zoom 6: Standard Screen

Graph: y1 =x3 - 4x2 -129x + 396

An appropriate viewing window should show relative max, relative min, intercepts; or we may
want to zoom in or out to see intersection of lines.

Graphing a circle: x2 +y2 = 9

The graphical solution to: 2x = 6 -x

Algebraic solution gives exact solution, whereas graphing solution is often an approximations.
Graph:

•Do these lines intersect?

Solve: over the interval [ 1, 6 ].

Solving equations graphically x2 + 5x + 6 > 0

Solving equations graphically x3 - 4x2-129x + 396 > x2 + 6x + 125