Mathematics
High School (9–10)
General
Algebra › Linear Equations in Two VariablesAlgebra › Pairs of Linear EquationsCoordinate Geometry › Straight LinesChapter 7Linear Equations in Two Variables
A pen and a notebook together cost 10 dollars. How much does each one cost? There is not one answer. There are many. In this chapter we write such a puzzle as an equation with two unknowns, and we draw all its answers as a straight line. Then we put two equations together, and we find the one answer that fits both. We use Python to draw the lines and to check our work.
Part of Mathematics · High School (9–10) (chapter 7)
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Linear Equations and Their Graphs
Two pens and a notebook cost 10 dollars. Which prices are possible? An equation with two unknowns has many answers. In this course we learn to find them, and we draw them all as one straight line.
Pairs of Linear Equations
A boat goes with the river and against the river. From two journeys, can we find the speed of the boat and the speed of the river? Yes, with two equations. Here we solve a pair of equations by drawing, by substitution and by elimination.