﻿ Solving Linear Equations, all mixed up
SOLVING LINEAR EQUATIONS, ALL MIXED UP
by Dr. Carol JVF Burns (website creator)
Follow along with the highlighted text while you listen!

EXAMPLES:
Solve: $\,2x - 1 = 5\,$
Solution:
 $2x-1=5$ original equation $2x=6$ add $\,1\,$ to both sides $x = 3$ divide both sides by $\,3$
Solve: $3 - 2x = 5x + 1$
Solution:
 $3 - 2x = 5x + 1$ original equation $3 = 7x + 1$ add $\,2x\,$ to both sides $2 = 7x$ subtract $\,1\,$ from both sides $\frac{2}{7} = x$ divide both sides by $\,7\,$ $x = \frac{2}{7}$ write in the most conventional way
Solve: $\displaystyle -3x -\frac{8}{9} = \frac{5}{6}$
Solution:
 $\displaystyle -3x -\frac{8}{9} = \frac{5}{6}$ original equation $\displaystyle 18\left(-3x -\frac{8}{9}\right) = 18(\frac{5}{6})$ multiply both sides by $\,18\,$, which is the least common multiple of $\,9\,$ and $\,6\,$ $-54x - 16 = 15$ simplify; all fractions are gone $-54x = 31$ add $\,16\,$ to both sides $\displaystyle x = -\frac{31}{54}$ divide both sides by $\,-54\,$
Master the ideas from this section

When you're done practicing, move on to:
Simple Word Problems resulting in Linear Equations

For more advanced students, a graph is displayed.
For example, the equation $\,3 - 2x = 5x + 1\,$
is optionally accompanied by the graph of $\,y = 3 - 2x\,$ (the left side of the equation, dashed green)
and the graph of $\,y = 5x + 1\,$ (the right side of the equation, solid purple).
Notice that you are finding the value of $\,x\,$ where these graphs intersect.
Click the “show/hide graph” button if you prefer not to see the graph.

 Solve: