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Browse High School Equations, Graphs, Translations
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Asymptotes.
Direct and indirect variation.
Slope, slopeintercept, standard form.
 Two Slopes, and Two Ways to Average Them [01/06/2016]

An adult has questions about the validity of a colleague's simple
method to average slopes — and about simplifying his own, more
involved approach. With sketches, trigonometric identities, and
conjugate products, Doctor Peterson explains the methods, and shows
their equivalence.
 Types of Linear Systems [10/13/1997]

What is meant when a type of linear system is said to be a consistent or
an inconsistent system?
 Understanding Parametric Equations [04/02/1998]

Can you explain the basic principles of parametric equations?
 Units for Inverse Quantity [9/10/1996]

I have a graph of time vs. 1/distance. What units do I use for 1/
distance  cm^1?
 Uses for Parametric Equations [04/23/1998]

What is a parametric equation used for? Can you give me an example?
 Using Cardan's Formula to find Real Roots [04/13/2000]

How can I show that, although the cubic equation x^3  6x = 4 has three
real solutions, Cardan's formula can find them by subtracting appropriate
cube roots of complex numbers?
 Using Descartes' Method of Tangents [10/2/1995]

Given a point P(3,9) on a parabola y=x^2, how do I find the slope of the
tangent to the parabola at point P using Descartes' method of tangents?
 Using Graphs to Solve Problems [12/29/1996]

How do you use graphs to find the answers to questions?
 Using xIntercepts to Sketch Parabolas [08/04/2002]

How does knowing the xintercepts of a parabola help me sketch it?
 Variation Per Unit of Time [02/22/2002]

Why does the slope of a line correspond to the space that the particle
runs per unit of time?
 A Way to Remember What 'm' and 'b' Mean in SlopeIntercept Form [02/01/2004]

An interesting memory trick to help you remember how to graph a linear
equation in slopeintercept form.
 What We're Doing When We Do Algebra [03/25/2002]

How do you graph x + y = 5 on a graph sheet?
 Write in SlopeIntercept Form [11/06/1997]

Write and sketch x  y + 2 = 0 .
 X and YIntercepts [09/15/1998]

I'm having a hard time finding out how to solve an equation and then do
the graph. The intercepts confuse me also...
 X Line in a 3D Graph [03/10/2001]

Which is the x line  vertical or horizontal?
 X = TanX [03/21/2001]

Show that x = tanx has an infinite number of solutions.
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