Note:
Some of these equations are so simple that you may want to solve them by inspection.
That is, just stop and think:
What number, minus $\,3\,$, gives $\,5\,$?
Solve:$\,2x = 5\,$
Answer:$x = \frac{5}{2}$ Note: You can input this answer as 2.5 or 5/2 .
That is, you can input answers as fractions or decimals.
Solve:$\,2x - 1 = 5\,$
Answer:$x = 3$ Note:
For some of the more complicated equations,
you may want to use the Addition and Multiplication
Properties of Equality.
$2x-1=5$
original equation
$2x=6$
add $\,1\,$ to both sides
$x = 3$
divide both sides by $\,2$
Master the ideas from this section
by practicing the exercise at the bottom of this page.
For more advanced students, a graph is displayed.
For example, the equation $\,2x - 1 = 5\,$
is optionally accompanied by the
graph of $\,y = 2x-1\,$ (the left side of the equation, dashed green)
and the graph of
$\,y = 5\,$ (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.